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Clients rate Android App developers
Rating is 4.8 out of 5.
4.8/5
based on 426 client reviews
  • $35 hourly
    • 5.0/5
    • (6 jobs)
    ✅ Flutter Mobile App Developer with 6+ years of experience; ✅ Master's degree in Software Development; ✅ Developed from scratch 2 crypto apps - mobile exchange and wallet; ✅ In general developed 8+ apps which were successfully deployed to google and apple stores. I am an Expert Flutter Mobile App Developer with 6 years of experience and I develop beutiful apps for Android and iOS . I'm proficient in Dart . I don't do FlutterFlow . A lof of my apps use Lavarel backend. But if you don't want to implement a backend then we can use Firebase . I don't do Full stack ( full-stack , fullstack ) development. I prefer Flutter to React Native in mobile development because I don't lile JS. Most of websites for my apps written in React , WordPress . 🛠 Technologies: Flutter: Flutter Framework, flutter_riverpod, provider, flutter_bloc, flutter_redux + redux_think, dio, freezed, hooks_riverpod + flutter_hooks, auto_route, centrifuge, web_socket_channel, flutter cryptography libraries, signalr_core. Firebase: Firebase services - cloud messaging/dynamic links/crashlytics/remote config/analytics.
    Featured Skill Android App Development
    Dart
    Location-Based Service
    In-App Purchases
    iOS Development
    User Profile Creation
    Tablet
    React Native
    User Authentication
    Firebase
    Smartphone
    Android
    iOS
    Flutter
    Mobile App Development
  • $35 hourly
    • 4.9/5
    • (8 jobs)
    Hello✌️ Smartphones & tablets📲, watches⌚️, Bluetooth & WiFi connections📶, streaming 📡 development. Vast Expertise, Rapid Delivery, Mobile Technologies, Front-end Technologies, Back-end Technologies. Need assistance in any of these top areas? Welcome! 1. Deep Expertise in Mobile App Development As a seasoned mobile app developer team with over 50 tech specialists, we bring extensive experience to every stage of your product lifecycle. Whether you're launching an iOS app, an Android app, or a cross-platform solution, we support you from idea validation through to the App Store or direct distribution—ensuring efficient, high-quality mobile app development. 2. Accelerated Time to Market My structured development process allows us to deliver iOS apps and Android apps up to 30–50% faster than average providers. As a results-driven mobile app developer, we prioritize reduced Time to Market—giving your business a competitive advantage in fast-moving digital markets. 3. Expert Mobile Technologies Build an exceptional iOS app or Android app with my dedicated mobile app development team. Each mobile app developer at Natife is highly skilled in technologies like Swift, Kotlin, Java, and Objective-C—ensuring top performance, native responsiveness, and clean architecture. 4. Engaging Front-End Interfaces My team of front-end experts collaborates closely with every mobile app developer to create stunning, interactive UI components. Whether for an iOS app or an Android app, we design with purpose—ensuring user engagement and intuitive navigation. 5. Scalable Back-End Solutions A robust back end is essential to seamless mobile app development. As a Mobile app developer, I integrate secure, scalable server logic for both iOS apps and Android apps, ensuring your product performs under high load and delivers consistent user experiences across all platforms. Mobile App Tech Stack ⚜️ Android app development: Kotlin, Java, Jetpack Compose ⚜️ iOS app development: Swift, Objective-C, RxSwift, SwiftUI ⚜️ Back end: JavaScript/TypeScript, Node.js, GraphQL, REST API, AWS, SQL, Serverless ⚜️ Front end: React, Redux, Vue, MUI, Vuetify Case Highlights from Our Mobile App Developers: 📌 As a Mobile app developer for iOS and Android, I’ve built 10+ health apps used by 500,000+ users worldwide—featuring biometric sensors, HIPAA compliance, and real-time health tracking. 🩺📊 📌 As a Mobile app developer for iOS and Android, I’ve created fintech and e-commerce apps that processed over $15M annually with 99.98% uptime and PCI DSS-compliant payment systems. 💰📱 📌 As a Mobile app developer for iOS and Android, I developed productivity platforms using AI to automate workflows—helping teams manage over 250,000 tasks and increase retention by 37%. 🧠📅 📌 As a Mobile app developer for iOS and Android, I built logistics and booking apps across 60+ cities, enabling 1M+ successful deliveries and reservations via real-time GPS tracking. 🚗📍 📌 As a Mobile app developer for iOS and Android, I launched IPTV and streaming apps used by 100K+ daily viewers, with playback latency optimized to under 0.8s. 📡🎧 📌 As a Mobile app developer for iOS and Android, I released social and fitness apps with 2M+ downloads, real-time chat, fitness tracking, and viral mechanics that boosted daily active users by 45%. 💬💪 Reach out to us in the Upwork chat📩, and we will discuss all important matters. Regards, Valerii
    Featured Skill Android App Development
    Native App
    Native App Development
    Firebase
    SwiftUI
    Mobile App
    Smartphone
    Smart TV
    Wear OS
    iOS
    Apple Watch
    Kotlin
    Mobile App Development
    Swift
    iOS Development
  • $40 hourly
    • 5.0/5
    • (11 jobs)
    👩‍💻 Hi! I'm Ann - Your Expert Mobile App Developer As a seasoned Mobile App Developer, I specialize in creating high-performance native apps for iOS and Android, using Swift, Kotlin, and Java. My deep knowledge as a Mobile App Developer spans across SwiftUI, Combine, Jetpack Compose, ARKit, and the Android SDK, enabling me to deliver world-class mobile experiences. Throughout my career as a Mobile App Developer, I’ve helped 60+ companies and startups turn their app ideas into full-fledged products. With 7+ years of commercial experience in Mobile App Development, I’ve partnered with 40+ global clients, providing scalable, future-proof mobile solutions. From native iOS to Android, I approach every project as a passionate Mobile App Developer focused on quality, performance, and results. As a Mobile App Developer, I lead a strong, dedicated team of 50 Mobile App Developers — each contributing their expertise to build exceptional mobile applications. We’re proud to be a Top Rated Plus Mobile App Development team on Upwork, with a 100% job success score and only 5-star reviews. Every Mobile App Developer on our team shares the same vision: to exceed expectations and deliver mobile products that drive impact. ✅ Helped 60+ companies build top-tier mobile apps ✅ 7+ years of hands-on Mobile App Development experience ✅ 40+ global partners supported in achieving digital success ✅ A collaborative team of 50 Mobile App Developers ✅ Top Rated Plus Mobile App Development agency ✅ 100% Job Success and consistent 5-star feedback ✅ Reliable, scalable, and high-performing mobile solutions 🔧 Services I Provide as a Mobile App Developer: Full-cycle Mobile App Development — from idea to deployment Native iOS & Android Development (Swift, Kotlin, Java) UI/UX Design tailored for Mobile App Users Performance Optimization by an experienced Mobile App Developer Secure API Integrations & Cloud Services Cross-Platform Solutions using Kotlin Multiplatform & Flutter Wearable & Bluetooth Device Integration for Mobile Applications Scalable Backend Connections for Mobile Infrastructure 🎯 Industries I Specialize in as a Mobile App Developer: 📦 E-Commerce Apps – built by a results-driven Mobile App Developer 🍔 Food & Drink Apps – delivered by a reliable Mobile App Developer 📚 Educational Apps – engaging experiences crafted by a Mobile App Developer 💪 Health & Fitness Apps – feature-rich apps from a Mobile App Developer 💘 Dating Apps – real-time systems designed by a top Mobile App Developer 🎬 Entertainment & Streaming – robust apps made by a skilled Mobile App Developer 💼 Finance & Banking – secure transactions with a professional Mobile App Developer 🌍 Travel Apps – GPS-powered journeys led by a seasoned Mobile App Developer 📱 SaaS Platforms – scalable systems by an enterprise-grade Mobile App Developer ⌚ Wearable Tech – Apple Watch & WearOS apps from a specialized Mobile App Developer 🚀 Advanced Features I Build as a Mobile App Developer: ✔️ Social Login (Google, Apple, LinkedIn) ✔️ Real-time Reviews & Feedback Systems ✔️ Offline Functionality & Data Syncing ✔️ Google & Apple Maps Integration ✔️ Real-Time Video Chat (WebRTC), Messaging & Push Notifications ✔️ Twilio Audio/Video/Chat Features ✔️ Monetization with AdMob, Facebook Ads ✔️ Bluetooth & Geofencing for Smart Devices 📩 Whether you’re a startup or enterprise, I’m the Mobile App Developer who can turn your vision into reality. Let’s connect and create something amazing together! 🚀 Our portfolio spans a wide range of industries, including fitness, healthcare, fintech, streaming, and e-commerce. We build robust applications that feature real-time functionality, Bluetooth and IoT integrations, GPS and mapping, secure API development, and cloud-connected solutions. Our team is also skilled in implementing advanced features such as in-app messaging, offline support, Firebase integration, AR experiences with ARKit, Jetpack Compose UI, and wearable tech, including WearOS and Apple Watch apps. We’ve developed for platforms like TVOS and Monkey-C (Garmin), and we bring a strong focus on product design, agile development, and smooth App Store/Play Store deployment. Whether you're a startup seeking a fast, flexible MVP or an enterprise aiming for long-term scalability, we offer global mobile app development expertise backed by 5-star client reviews and a commitment to building user-centric apps that perform at scale.
    Featured Skill Android App Development
    iOS
    Native App
    Android App
    Smart TV
    Smartphone
    Mobile App
    Mobile App Development
    Native App Development
    SwiftUI
    Firebase
    Swift
    iOS Development
    Wear OS
    Kotlin
  • $50 hourly
    • 5.0/5
    • (10 jobs)
    I am a Senior Android Software Engineer with over 7+ years of commercial experience and a Bachelor’s degree in Computer Science. I specialize in end-to-end Android development, from concept to launch, with expertise in creating high-performance, scalable native apps in Kotlin and Java. Here’s what I bring to your project: - 𝗙𝘂𝗹𝗹 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗟𝗶𝗳𝗲𝗰𝘆𝗰𝗹𝗲: I handle every stage, including planning, coding, testing, and deployment, ensuring smooth project flow and timely delivery. - 𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗳𝗿𝗼𝗺 𝗠𝗩𝗣 𝘁𝗼 𝗙𝘂𝗹𝗹 𝗦𝗰𝗮𝗹𝗲: I can create MVPs that validate your concept and iterate with new features to reach full functionality. - 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻: I focus on efficient code and proactive optimizations to keep your app fast, responsive, and memory-efficient. - 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: I ensure reliability through robust testing strategies, including unit tests, instrumentation and UI testing. - 𝗔𝗻𝗮𝗹𝘆𝘁𝗶𝗰𝘀 & 𝗠𝗲𝘁𝗿𝗶𝗰𝘀: I integrate analytics and performance metrics, so you gain actionable insights into user behavior, engagement, and app performance. - 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝗼𝗹𝘃𝗶𝗻𝗴: With years of experience troubleshooting, I quickly identify and resolve issues. 𝗠𝘆 𝘁𝗲𝗰𝗵 𝘀𝘁𝗮𝗰𝗸: - MVI, MVVM, MVP - Clean architecture - Kotlin Coroutines, RxJava - Android Jetpack Libraries - Custom Views, Jetpack Compose - Room, Realm, Couchbase - Dagger, Hilt, Koin - Retrofit, OkHttp - Glide, Coil - Moshi, Gson, Jackson - REST, Json, XML - Firebase SDKs (Authentication, Firestore, Crashlytics, Analytics, FCM) - Google Ads, Google Billing, Subscriptions, In-App purchases - BLE - 3rd party libraries integrations - Modularization for scalable project structure - AI Integration - JUnit (Unit and integration testing) - Espresso (UI testing) - MockK/Mockito - Robolectric - ArchUnit/Konsist (Architecture testing) -Agile Methodologies -Version Control (Git) Let’s collaborate to transform your app vision into a high-quality, user-focused Android experience that delivers real results!
    Featured Skill Android App Development
    Camera
    Android UI Design
    REST API
    Android Smartphone
    AI Chatbot
    Firebase
    Android SDK
    Mobile App Development
    Android App
    Mobile App
    Artificial Intelligence
    Java
    Kotlin
    Android
  • $35 hourly
    • 5.0/5
    • (6 jobs)
    Hey, I'm Anfisa - BD from PlayJoy Studios - game development & art outsourcing company established 5 years ago. I will be your guide in the art and game development process and be available 24/7, always ready to help and answer any questions! We are a team of professionals with 5-10 years of experience in the industry. We have great experience with mobile platforms - more than 20 games we worked on and/or successfully ported. One of the games, Turnip Boy Commits Tax Evasion received a Best Mobile Port'22 award (Pocket Gamer Awards). And the latest game we worked on, Strange Horticulture, in cooperation with publishers Iceberg Interactive and Plug in Digital, was very successful - the game received positive reviews and high rates in the stores - 4.9 in Google Play and 5.0 in AppStore. We also have experience with more niche platforms, like Amazon Mobile, Amazon Kids, Apple TV. We are also experienced in working on PC and consoles - we work with both MacOS and Windows and all consoles - both Gen 8 and 9. We can also help with adding games to GOG, MS Store (incl. Game Pass) and EGS, SDK integration etc. Lately we also provided services on adding cross-play multiplayer support and cross-platform invites. Here's also a breakdown of services we provide: 🟪Full game or prototype development - can develop any game from scratch; 🟪Сo-development - help with the project or specific tasks (SDKs, optimization, etc.); 🟪Game testing - we have a strong QA team ready to test your game from a fresh perspective and spot any issues; 🟪Game porting - to mobile & consoles (PS, XBOX, Nintendo Switch, etc); 🟪Art production- all types art creation for 2D/3D, animations & VFX; 🟪Game design - game concept and GDD creation; 🟪Live-ops support - support & new content updates for your existing projects. We guarantee excellent quality of work, great response to change requests and friendly, mutually beneficial cooperation. We are flexible and can help you on any project stage. Reach out to us and we guarantee your full satisfaction with our work!
    Featured Skill Android App Development
    iOS Development
    Game Design
    Game Development
    QA Testing
    Game Art
    PlayStation
    Art Direction
    Xbox
    Art & Design
    App Development
    Game Testing
    Game Development Bug Fix
    Game Design Document
    Game Consultation
  • $32 hourly
    • 5.0/5
    • (6 jobs)
    🚀 Hey there! 𝐋𝐄𝐓'𝐒 𝐑𝐎𝐂𝐊 🚀 🌟 5-Star Reviews 🌟 8+ Years of Experience 🌟 Top-Notch Developers 🏆 Top 30 Mobile App Developers 🏆 Fluent English 🏆I have strong problem-solving skill ► Natife Team is a mobile app development company committed to delivering exceptional architecture, design, and software solutions tailored to each client's needs. We understand the individuality of every business, encompassing its structure, processes, values, and product vision. As a trusted partner, we facilitate business expansion through comprehensive IT consultancy, staffing, end-to-end mobile app development, and product enhancement services. As a mobile app developer, I’ve spent over 8 years mastering iOS app and Android app development—delivering intuitive, scalable experiences with a strong foundation in Swift and Kotlin. Whether it’s real-time health tracking or complex UI animation, I approach each project as a mobile app developer focused on performance and user satisfaction through high-quality mobile app development. As a mobile app developer, I’ve launched over 50 iOS apps and 40 Android apps, with millions of combined downloads and consistently high App Store ratings. From MVPs to enterprise-grade products, I’ve led mobile app development projects across fintech, wellness, logistics, and social networking. As a Smart Watch mobile app developer, I’ve created 10+ companion apps for Apple Watch and Wear OS. My experience includes building iOS apps that deliver precise workout data and Android apps that extend phone functionality to the wrist—ensuring cross-device continuity through cohesive mobile app development practices. In mobile app development, I use modern frameworks like SwiftUI and Jetpack Compose. As a hands-on mobile app developer, I’ve built apps with background processing, offline caching, and secure sync logic using REST APIs, enhancing the reliability of every iOS and Android app I deliver. As a mobile app developer, I’ve built over 40 iOS apps and 35 Android apps, delivering seamless user experiences across platforms and serving 5M+ users in 12+ industries, using consistent, scalable mobile app development principles. My portfolio as a healthcare mobile app developer includes iOS apps and Android apps used by 600,000+ patients in 12 countries to track vitals and book over 100,000 appointments. As a fintech mobile app developer, I developed iOS apps and Android apps that process $20M+ annually, with support for 30+ currencies and a 99.99% success rate in transactions. Acting as a productivity mobile app developer, I delivered iOS apps and Android apps that automate 70+ workflows, manage 500,000+ tasks, and increase team efficiency by 40%. As a logistics mobile app developer, I built scalable iOS apps and Android apps supporting 1.2M+ live bookings in 60+ cities, with 98% uptime and real-time GPS tracking powered by robust mobile app development infrastructure. In my role as a streaming mobile app developer, I launched iOS apps and Android apps serving 800,000+ monthly active users, offering <100ms latency and offline playback—driven by performance-optimized mobile app development workflows. As a lifestyle mobile app developer, I created iOS apps and Android apps downloaded 2M+ times, boosting daily user engagement by 45% through wellness and social features—crafted with user-centric mobile app development in mind. As a weather mobile app developer, I launched iOS apps and Android apps with real-time forecasting for 100,000+ concurrent users, delivering updates in <500ms through efficient, API-driven mobile app development. As a fitness mobile app developer, I developed iOS apps and Android apps tracking workouts and syncing with 10+ wearable devices, logging millions of activity minutes. As a restaurant mobile app developer, I created iOS apps and Android apps for 150,000+ users, with GPS delivery tracking and loyalty features increasing retention by 25%. As a hotel booking mobile app developer, I designed iOS apps and Android apps used to book over 500,000 room nights across 20+ countries, with real-time confirmation. As a TVOS mobile app developer, I built iOS apps and Android apps supporting IPTV and VOD streaming with 260+ channels and 100K+ monthly viewers. As an e-commerce mobile app developer, I engineered iOS apps and Android apps featuring 1M+ product listings, handling 50K+ daily transactions with secure checkouts. As a vehicle tracking mobile app developer, I created iOS apps and Android apps that log 2M+ km/month, update routes every 10 seconds, and serve 50 K vehicles. As a doctor booking mobile app developer, I developed iOS apps and Android apps that manage 300,000+ secure appointments, with calendar sync and encrypted messaging. As a dating mobile app developer, I delivered iOS apps and Android apps with 3M+ matches, 100K+ daily chats, and location filters across 40+ cities—each designed with scalable mobile app development frameworks.
    Featured Skill Android App Development
    Android
    Mobile App Design
    iOS
    Native App
    Android App
    Smartphone
    Smart TV
    SwiftUI
    Firebase
    Mobile App
    Kotlin
    Swift
    Mobile App Development
    Native App Development
  • $32 hourly
    • 5.0/5
    • (6 jobs)
    🚀 Native Mobile App Developer | Kotlin • Swift • Android • iOS • Mobile App Development 👋 Hi! I'm Yehor — a Native Mobile App Developer with 8+ years of experience in Mobile App Development. I’ve delivered over 50 successful iOS and Android apps with flawless performance and beautiful UX. As a Top Rated Mobile App Developer on Upwork with 30+ five-star reviews, I help startups and enterprises launch scalable, future-proof mobile products. From real estate, fitness, and meditation apps to e-commerce, logistics, and booking platforms, my Mobile App Development skills cover every business niche. Whether you’re building a new iOS or Android solution — or optimizing your current Mobile App Development lifecycle — I bring precision, speed, and creativity to the table. ✅ What I Offer as a Mobile App Developer: 🧠 Product Design & Development: Full-cycle Mobile App Development from prototype to store release Interactive prototypes, animations, user onboarding, and localization UI/UX design via Figma, Sketch, and Adobe XD 🛠️ Native iOS & Android Development: As a dual-platform Mobile App Developer, I work with: Swift, SwiftUI, RxSwift, Objective-C for iOS Development Kotlin, Jetpack Compose, Java for Android Development Mobile App Development for tablets, Apple Watch, Wear OS, and Apple TV Biometric authentication, AR, NFC, QR scanners, and push notifications 📊 Scalable Architecture & Integrations: REST APIs, Firebase, Core Data, MongoDB, Realm, SQLite SDK integration, analytics tools, real-time collaboration, cloud sync Support for third-party services, mobile game development, CMS & monetization ☁️ Cloud & Backend Services: Mobile App Development powered by AWS, Google Cloud, GitLab, Bitbucket CI/CD pipelines with Fastlane, TestFlight, App Store Connect Secure and scalable mobile backend microservices Mobile network optimization, clean code practices, MDM, and version control 📲 Business-Focused Mobile Solutions: As a Mobile App Developer, I focus on: Performance optimization and session management Voice assistant integration (Siri, Google Assistant, Alexa) Data visualization, geolocation, GPS, wearable support Custom onboarding flows, accessibility features, retention strategies 💬 Ready to Launch Your Next App? Let’s build your iOS or Android app with world-class Mobile App Development skills. Whether you're a startup in need of an MVP or an enterprise scaling globally — I'm the Mobile App Developer who can take your vision to the app stores. 📱 Over 15+ industries served — including fitness, real estate, e-commerce, salon, blockchain, chat apps, audio & video platforms, and more. ⏳ Let’s talk today — and turn your idea into a powerful iOS/Android Mobile App Development success story. 📩 Drop a message — your trusted Mobile App Developer is just one click away.
    Featured Skill Android App Development
    iOS SDK
    Mobile App Design
    Mobile App Development
    Mobile App Bug Fix
    Native App Development
    watchOS
    AI App Development
    iOS Development
    SwiftUI
    Swift
    Kotlin
    iOS
    Mobile App
    Android
  • $60 hourly
    • 5.0/5
    • (2 jobs)
    Hi everyone, I am a senior mobile and web fullstack developer with over 6 years of experience in React/Vue, React Native, NextJS, Flutter, Swift, Java, Kotlin. React : 9.5/10, +6 years Vue: 9.5/10, +6 years React Native: 9.5/10, + 6 years NextJS: 9/10, +5 years Flutter: 9/10, +5 years Swift/SwiftUI: 9/10, +5 years Java/Kotlin: 8/10, +4 years TailwindCSS: 9/10, + 5 years Typescript: 9/10, + 5 years Node/Firebase: 9/10, +6 years Also, I’m hands-on with project architecture, always considering the best technology and approach to optimize time, resources, and costs. My expertise covers a wide range of technologies, including JavaScript/TypeScript, ReactJS/VueJS, and NodeJS, in both front-end and back-end development. I am available to work full time in any timezone. Let's get in touch. Thank you.
    Featured Skill Android App Development
    Vue.js
    Node.js
    AWS Amplify
    Firebase
    Web Development
    iOS Development
    SwiftUI
    Swift
    Flutter
    Redux
    React Native
    React
    Kotlin
    Java
  • $40 hourly
    • 4.6/5
    • (3 jobs)
    Experienced Developer with a strong focus on live streaming and real-time communication solutions, including expertise in Livekit, WebRTC, VoIP, and multimedia integration. Skilled in developing cross-platform mobile applications for iOS and Android using React Native, Flutter, and Swift. Proficient in building scalable, high-performance backends with Node.js, Django, FastAPI, Golang, Java, and Spring Boot, and designing robust APIs with REST and GraphQL. Adept at creating seamless user interfaces with React, Next.js, Angular, Vue.js, and advanced UI/UX principles. Extensive experience in AI and automation, including developing AI Voice Agents, chatbots with OpenAI models, LangChain, and AI-powered knowledge retrieval with Pinecone. Skilled in integrating payment solutions such as Stripe, PayPal, and crypto gateways, as well as blockchain development with Ethereum, Solana, and smart contracts. Experienced with Electron.js for desktop applications and database management using MongoDB, PostgreSQL, MySQL, and serverless platforms like Firebase and Supabase. Passionate about delivering innovative, real-time, scalable applications with a focus on multimedia, AI, and secure communication technologies. ✅ My Services ✔ Immediate Availability: I’m ready to start your project right away. ✔ Flexible Work Hours: I can work in your preferred time zone. ✔ 24/7 Communication: I’ll maintain constant communication and be available whenever needed. ✅ My Experience ✔ Developed cross-platform mobile applications using Swift, Flutter and React Native, ensuring seamless performance on both iOS and Android devices. ✔ Engineered live streaming and real-time communication solutions leveraging Livekit, WebRTC, and VoIP technologies such as Twilio, FreeSWITCH, and Asterisk, to deliver high-quality multimedia interactions. ✔ Developed an AI Voice Agent Platform using online services like Retell.ai, VAPI, and Dasha.ai. ✔ Created chatbots using OpenAI models and LangChain. ✔ Designed workflow generation using LangGraph. ✔ Built an AI Assistant for team meetings using Twilio, GPT-4, STT (Deepgram, Whisper), and TTS (ElevenLabs). ✔ Implemented RAG Knowledge features using LangChain, Pinecone, and AI. ✔ Developed Electron-based desktop applications. ✔ Designed user-friendly interfaces with React, Next.js, Angular.js, and Vue.js. ✔ Built scalable backends using Node.js, Express.js, Python, Django, FastAPI, Golang, Java, and Spring Boot. ✔ Created RESTful APIs and GraphQL APIs for seamless communication between systems. ✔ Designed and managed databases using MongoDB, PostgreSQL, MySQL, and serverless technologies like Supabase and Firebase. ✔ Integrated payment solutions such as Stripe, PayPal, and crypto payment gateways for e-commerce platforms. ✅ Frameworks and Tools ✔ Live Streaming & Real-Time Communication: Livekit, WebRTC, WebSocket, Signaling Servers, RTMP (for cross-platform streaming) ✔ iOS & Android development - React Native, Java, Quasar Framework - Android App Development, Mobile App Development(Flutter) - Swift, Objective-C ✔ AI & Automation - OpenAI API, ChatGPT Integration, AI Voice Agents, AI-driven Chatbots - AI solutions for Healthcare and Real-Time Communication - Twilio Integration ✔ Front-End Development - React, Next.js, TypeScript, JavaScript, Three.js, jQuery, HTML5, CSS3 - Tailwind CSS, Bootstrap, LESS, SASS, Material-UI, Ant Design - Web3 Integration and advanced UI/UX design principles ✔ Back-End Development - Node.js, Express.js, Electron.js - Python (Django, FastAPI, Flask) - PHP, Laravel - Golang, Java, Spring Boot - RESTful APIs and GraphQL APIs ✔ Database Management - MongoDB, PostgreSQL, MySQL - Serverless databases like Supabase and Firebase ✔ Blockchain Development - Blockchain, Ethereum, Solana, Algorand - Cryptocurrency, Web3, Smart Contracts ✔ Payment Integration - Stripe, PayPal, Crypto Payment Gateways (Bitcoin, Ethereum, etc.) - Subscription-based payment systems - Secure payment processing and checkout flows ✔ VoIP - FreeSWITCH/FusionPBX - Twilio - Asterisk/FreePBX I'm always eager to explore innovative technologies and seamlessly integrate them into my work. Let’s collaborate to bring your ideas to life!
    Featured Skill Android App Development
    Artificial Intelligence
    iOS Development
    DevOps
    OpenAI API
    Golang
    Node.js
    Python
    React
    Java
    WebRTC
    SwiftUI
    Swift
    Flutter
    React Native
  • $35 hourly
    • 5.0/5
    • (1 job)
    Hi, I’m Volodymyr Predzemirskyi, a developer with over 8 years of experience in AWS cloud infrastructure, AI agent development, and web & mobile app creation. I specialize in building scalable serverless solutions, designing cloud architectures, developing intelligent AI agents, and creating high-performance web and mobile apps. Key Skills AWS Infrastructure: - AWS Serverless Framework, AWS SAM, CDK - EKS, ECS, EC2, Lambda, API Gateway, S3 - Node.js, TypeScript, Python, Golang - OpenAI API Integration - API Development, CI/CD, CodePipeline, Docker, Kubernetes - Terraform - Git, Version Control, Agile Methodology AI Agent Development: - Voice Agents, Chatbots, LLMs, AI Automation - AI Meeting Agents (Google Meet, MS Teams, Zoom integration) - OpenAI Real-time API and Recall.ai, RetellAI, BrowseAI - AI-Driven Virtual Assistants Mobile App Development: - Cross-Platform (React Native, Flutter, Ionic) - Android (Java, Kotlin) - iOS (Swift, Objective-C) - UI/UX Design, API Integration, Mobile Optimization Web App Development: - React, Next.js, Angular, Vue.js, Tailwind CSS, ShadcnUI, HeroUI, MUI, Quasar - Redux, ContextAPI, Jotai, Zustand, NgRx, Akita - Flask, Django, Node.js, Express, Golang - GraphQL, Prisma, tRPC With my expertise in AWS cloud, serverless architecture, AI integration, and Web/Mobile development, I help clients achieve their goals through innovative, scalable, and user-friendly solutions. Whether you need a serverless backend, cutting-edge AI integration, or an AI-powered app, I have the skills to ensure your project succeeds. I am committed to quality, meeting deadlines, and delivering excellent service. Let’s connect and make your project a success! Best regards, Volodymyr Predzemirskyi
    Featured Skill Android App Development
    iOS Development
    Flutter
    React Native
    Mobile App Development
    React
    Python
    Node.js
    OpenAI API
    AI Agent Development
    Web Development
    Cloud Computing
    Serverless Computing
    AWS Lambda
    Amazon Web Services
  • $50 hourly
    • 5.0/5
    • (70 jobs)
    🥇 Top 1% - UpWork Mobile Solutions. Working with Flutter and mobile development for the last 16 years. My skill-set: ✔ Cross-platform: Flutter, Compose Multiplatform ✔ iOS: Swift, Objective-C, UIKit, SwiftUI ✔ Android: Kotlin, Java, Jetpack Compose ✔ Backend: FastAPI, Django, Spring, Spring Boot, Node.JS Checkout some interesting projects I worked on in the work history and portfolio sections below ⤵️
    Featured Skill Android App Development
    Flutter Stack
    Mobile Development Framework
    Mobile App
    Android
    iOS
    AI Mobile App Development
    Mobile App Improvement
    Kotlin
    Mobile App Development Consultation
    Mobile App Development
    Python
    Swift
    iOS Development
    Flutter
  • $50 hourly
    • 5.0/5
    • (26 jobs)
    I'm the founder of Sirin Software, a Florida-based R&D company with a development center in Kyiv, Ukraine. My team and I, comprising more than 40 software developers, work with embedded systems, IoT products, and Web3 applications. We have extensive experience in hardware design and software development. Core values: Solution-Centric Approach: We focus on solving problems and contributing to product concepts—we're more than just coders. Honesty: We never overpromise. Client Satisfaction: Delivering 5-star client experiences is our top priority, as reflected in real client reviews. Our main areas of expertise include: Embedded Linux: Device Drivers, BSPs, Yocto, Buildroot, OpenWRT Wired and Wireless Networking (WiFi, Bluetooth, ZigBee/Z-Wave, LoRaWAN, and more) Bare-metal and RTOS-based firmware for ARM and RISC-V (STM32, ESP32, nRF52, etc.) Cybersecurity: Network monitoring, intrusion detection Web3: Ethereum and Solana blockchain solutions Our hard skills (not limited to) include: C, C++, Python, Rust, Golang, JS/TS, Node.js, React.js, AWS, GCP, and MS Azure.
    Featured Skill Android App Development
    Bash Programming
    Microsoft Azure
    Node.js
    OpenWrt
    iOS Development
    C++
    Embedded System
    Embedded Linux
    C
  • $31 hourly
    • 5.0/5
    • (10 jobs)
    🧲 𝗙𝗲𝘄 𝗙𝗮𝗰𝘁𝘀 𝗮𝗯𝗼𝘂𝘁 𝗺𝘆 𝘄𝗼𝗿𝗸 𝗿𝗲𝘀𝘂𝗹𝘁𝘀: ❯ 𝗦𝗮𝘃𝗲𝗱 𝟭𝟬𝟬'𝟬𝟬𝟬$ for one of my customer by code optimization in accounting project ❯ 𝗦𝗮𝘃𝗲𝗱 $𝟱𝟬'𝟬𝟬 𝘁𝗼 $𝟭𝟬'𝟬𝟬𝟬 𝗳𝗼𝗿 𝗲𝗮𝗰𝗵 𝗰𝘂𝘀𝘁𝗼𝗺𝗲𝗿 by leveraging low-code solutions and a pre-written code base. ❯ My client hired 4 freelancers, but 𝗻𝗼𝗻𝗲 𝗰𝗼𝘂𝗹𝗱 𝘀𝗼𝗹𝘃𝗲 𝘁𝗵𝗲 𝗶𝘀𝘀𝘂𝗲 𝗹𝗶𝗸𝗲 𝗜 𝗱𝗶𝗱 - 𝗰𝗵𝗲𝗰𝗸 𝗿𝗲𝘃𝗶𝗲𝘄𝘀 ❯ Joined a project with DDoS-level server crashes caused by unseen faulty code; I fixed it, saving the system and cutting costs by 3x ✔ Projects Delivered: SaaS, Fitness, E-commerce, Healthcare, Fintech, Wellness, Agriculture, Logistics, Real Estate. 🔻 𝗜 𝗰𝗮𝗻 𝗰𝗼𝘃𝗲𝗿 𝗳𝗼𝗹𝗹𝗼𝘄𝗶𝗻𝗴 𝗻𝗶𝗰𝗵𝗲𝘀 & 𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀: ❯ Mobile App Development (iOS and Android) - Healthcare, Medical, Health, MedTech, Hospital - Meditation, Mood, Mental, Calm, Headspace,, Productive apps - Fitness, Sports, Training, Meal / Nutrition, Dietetics, - Wearable devices, Vital health indicators, Safety - SaaS for Agriculture , Fintech, Real Estate, Delivery, booking ❯ IoT sensors, smart devices and LTE, Lora devices connection ❯ AI Integration - OpenAI GPTs, Gemini, Llama , Llama2, OpenCV and more ❯ Payment integration - In-App purchase, Stripe, Way4Pay, RevenuCat, PayPal, Apple Pay, Google Pay and more ❯ Video Player - custom development & integration ❯ Promo Codes ❯ Google SDK (Maps, In-app Billing and etc.) Facebook SDK ❯ Integration with APIs and Third-Party Services ❯ Social Media integration (Facebook, Twitter, Instagram, G+, Youtube) 🔻 Skills: • FlutterFlow, Flutter (Dart), React Native, React • Firebase (firebase cloud firestore, authentication, database, analytics, crashlytics, notifications and etc.), Supabase, AWS, GCP , Azure, GoDaddy, Digital Ocean. • MongoDB, PostgreSQL, MySql, SQLite • NodeJS, ExpressJS • RESTful APIs • Figma & Photoshop, Sketch, Adobe XD resource extraction • FHIR, HL7, EMS, Spo2, MQTT, BLE, HealthKit, WatchKit Reach out to me by clicking the '𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯' 𝗯𝘂𝘁𝘁𝗼𝗻 𝗮𝗻𝗱 𝗺𝗲𝗻𝘁𝗶𝗼𝗻𝗶𝗻𝗴 𝗽𝗿𝗼𝗺𝗼 "𝟭𝟭𝟭𝟭𝟬𝟭" so I can conduct a free 30 minute consultation, in he worst-case scenario, you will have received competent recommendations.
    Featured Skill Android App Development
    Firebase Cloud Firestore
    iOS Development
    Android App
    iOS
    App Marketplace
    Firebase
    React Native
    Low Code & RAD Software
    Mobile App Development
    AI Mobile App Development
    Mobile App
    Dart
    Flutter
    FlutterFlow
  • $35 hourly
    • 5.0/5
    • (10 jobs)
    💛💙Greetings! We are Ukrainian Software Development Team💙💛 We are AndRud-Software, a dynamic mobile and web development team with a passion for turning your ideas into exceptional digital solutions. With a wealth of combined experience and a focus on aligning with your business objectives, we're here to exceed your expectations. Why Collaborate with Our Mobile Development Dream Team? ✅ Diverse Expertise: Our talented team of developers specializes in iOS, Android, Flutter, GraphQL, Postgres, Docker, Node.js, Firebase, and more. Whatever your platform, we've got the skills to make it happen. ✅ End-to-End Solutions: From concept to launch, we offer a complete range of services, including concept development, design, development, testing, deployment, and ongoing support. ✅ User-Centric Design: We understand the importance of creating visually stunning and user-friendly apps. Our designers and developers work hand-in-hand to deliver an exceptional user experience. ✅ Agile Approach: We embrace agile methodologies to ensure transparency and adaptability throughout the project. You'll have full visibility into the process, and we welcome your input at every stage. ✅ Stringent Testing: Quality assurance is at the core of our process. We conduct rigorous testing to eliminate bugs, glitches, and performance issues. ✅ Client Collaboration: We believe in the power of collaboration. Your insights and vision are invaluable, and we'll work closely with you to bring your app to life. Whether you need a single developer or an entire team, we provide flexible options to suit your business's specific requirements. Here's what our mobile team brings to the table: - Expertise in Flutter and Dart - Proficiency in iOS, Android, Swift, Objective-C, Java, and Kotlin - Versatility in client/server and database/web interfaces - UI/UX design capabilities - Familiarity with GraphQL - Database skills with Postgres - Experience with Docker, AWS, Hasura, and NodeJs Let's collaborate to create a digital solution that drives your business forward.
    Featured Skill Android App Development
    Firebase
    AWS Application
    Docker
    iOS Development
    Serverless Stack
    Flutter
    Team Management
    SQL
    Data Science
    Machine Learning
    Dart
    Git
    GraphQL
    Mobile App Development
  • $35 hourly
    • 5.0/5
    • (13 jobs)
    🗣️ "Top skilled and motivated developer. Always willing to suggest a better solution if possible. Highly recommended!" 🗣️ "The availability of Hleb was excellent, and he has outstanding communication skills. Rare talent among developers ;)" 👋 Hi! I'm a widely experienced software engineer with strong focus on mobile apps development. I've been creating mobile apps for the past 7 years - both front-end and back-end (fullstack). Experienced with Swift for iOS and Flutter, React Native for Android/iOS. I implemented practically everything an app could have: payments, notifications, Firebase integrations, chats, music apps, file sharing, encryption, geolocation, maps, share sheets, 3rd-party authentication, calendars etc. I can lead apps through the whole release cycle - from scratch to distribution. Good knowledge of App Store/iOS, Play Market/Android. CI/CD & automation. I try to think about user experience and bring suggestions to clients when I see better or simpler ways to make things. I also enjoy creating minimalist and tidy, but effective flows. Get in touch and I will solve your problem. github.com/hbarylskyi
    Featured Skill Android App Development
    Native App
    Android
    Java
    Firebase
    Flutter
    iOS
    Swift
    Mobile App Development
    iOS Development
  • $35 hourly
    • 5.0/5
    • (25 jobs)
    Experienced in cross-platform and native mobile app development, admin panels, dashboards, cloud, IoT solutions, web applications, and back-end (REST API, MQTT, etc) I am a Team Lead of the CitrusDev team, a Ukrainian software development company with over 40+ mobile and web developers, designers, project managers, DevOps, and QA specialists onboard. This means that besides my programming skills, you always have access to a full-stack product design & and development team. More about CitrusDev: CitrusDev provides customized software solutions for IoT startups, SaaS companies, eCommerce stores, LMS, and enterprise clients worldwide. From building the product from scratch to extending the existing teams, we have expertise in a diverse set of open-source technologies and platforms to bring innovation in an agile fashion. Our team excels in Java, Kotlin, Swift, Flutter, React Native, PHP, Laravel, WordPress, React.js, and Vue.js. With over 40+ people, CitrusDev has either empowered client teams or delivered end-to-end development projects for brands from the Internet of Things, consulting, eCommerce, marketing, or eLearning industries and is recognized as a Top IoT Developer in Ukraine by Clutch. Mykhailo, CitrusDev Team Keywords: iOS, Android, Flutter, BLE, Bluetooth, Core Bluetooth, Dart, Swift, Java, Kotlin, ESP32, IoT development, Internet of Things, embedded systems, IoT solutions, IoT firmware, IoT cloud, MQTT, WebRTC,, ESP32, Raspberry Pi, nRF, Nordic Semiconductors, NB-IoT, LPWAN, LoRaWAN, Zigbee, IoT architecture, IoT security, sensor integration, IoT protocols, real-time data processing, wireless communication, smart devices, cloud integration, AWS IoT, Azure IoT, Google Cloud IoT, ThingsBoard, Node-RED, Kaa IoT, OpenHAB, Home Assistant, industrial IoT, IoT automation, remote monitoring, IoT gateways, AIoT, machine learning for IoT, data analytics, smart home, smart city, smart farm, smart agriculture, agritech, healthcare, smart industry, smart logistics, IoT dashboards, IoT consulting, device-to-cloud, IoT scalability, low-power IoT, IoT connectivity, mobile app development, IoT mobile apps, cross-platform IoT apps, Flutter, native Android, native iOS, NFC, GPS tracking, telematics, wearable technology, connected devices, smart sensors, IoT-enabled automation, PCB development, hardware design, circuit design, custom IoT hardware, IoT prototyping, embedded hardware development, IoT manufacturing, cloud-based IoT platforms, real-time IoT analytics, IoT data visualization, edge AI, fog computing, MQTT brokers, CoAP, LwM2M, IoT fleet management, thermal printers, barcode scanners, RFID, heart rate monitors, ECG sensors, temperature sensors, humidity sensors, gas sensors, motion sensors, accelerometers, gyroscopes, pressure sensors, environmental monitoring, smart wearables, industrial sensors, medical IoT devices, IoT-based tracking solutions
    Featured Skill Android App Development
    Payment Functionality
    CSS
    Tablet
    Raspberry Pi Firmware
    STM32
    Flutter
    Internet of Things Software
    Internet of Things
    MySQL
    Internet of Things Solutions Design
    Bluetooth
    WordPress
    Android
    iBeacon
    Laravel
    iOS
    Vue.js
  • $35 hourly
    • 5.0/5
    • (21 jobs)
    Full-cycle iOS and Android Application development agency from Zaporizhzhya, Ukraine. Website-portfolio: [please ask for the link] Full-cycle means that we provide services at every stage of iOS and Android application development process. We grow our business by helping our customers to grow theirs. We build iOS apps (iPhone, iPad) and Android apps (phone and tablet) of any complexity or style (material style, flat style): - delivery and ordering systems related applications - logistics mobile applications - marketplace apps - video and chat applications, WebRTC / VoIP, socket connection - booking mobile apps - online TV applications - educational applications - applications for online stores - cleaning services - in-app purchases and in-app subscriptions related apps - iOS apps with iOS specific features - Android material apps with Android specific features - AndroidTV applications - you tell it - we do it iOS skills include but not limited to: - Swift 3 / Objective-C - iOS SDK, xCodeb - Protocols: JSON-RPC, XML, RPC, SOAP, REST. - Integration with existing social networks: Facebook, Twitter, Vkontakte, G+ - 2D games: Cocos2D, Cocos2Dx - E-books (static or interactive), Newsstand - Databases: SQLite, CoreData - BLE 4.0 - Mobile advertisement: iAd, AdMob, AppLeads, Flurry, AdWhirl - Other servises and SDKs: Braintree, Liqpay, Yandex.Money, Branch, Maps (OSM, Google, Apple), LinPhone, FrozenMountain, ooVoo, Flurry Analytic, Google Analytics, Crashlytics, Test Flight, other Android: - Java / Kotlin - Encryption: OpenGPG. - Protocols: JSON-RPC, XML-RPC, SOAP, TCP/IP. - simple applications OpenGL ES - Integration with social networks (Facebook, Twitter, Vkontakte, MailRu, Odnoklassniki), Google services (e.g. Youtube, Google Cloud Printing), Payment gateways (Braintree, PayPal, Liqpay, Yandex.Money) - Interaction with external devices (BLE 4.0/SPP/USB). - Android SQLite - Google Billing, in-apps - VoIP and WebRTC integrations React Native skills: - TypeScript - Node.JS (MERN stack) - JavaScript - Redux, - ES6+ - MongoDB - HTML5, React, CSS - Redux - Material UI Web technologies stack: - React.js, - Angular.JS, Angular 2+ - Laravel (PHP framework), - Symfony (PHP framework), - Node.JS, - VueJs - Express.js, - Bootstrap, - Jquery - Integration with social networks (Facebook, Twitter, Vkontakte, MailRu, Odnoklassniki), Google services (e.g. Youtube, Google Cloud Printing), Payment gateways (Braintree, PayPal, Liqpay, Yandex.Money) - Protocols: JSON-RPC, XML-RPC, SOAP, TCP/IP and much much more. You come to us with an abstract idea and after time we’ll submit a fully functional app to AppStore or Google Play Market. We create Tech Specs documentation, mockups, app designs, development itself, application updates as well as upgrades, along with many other services more or less connected with iOS and Android development.
    Featured Skill Android App Development
    Web Development
    Vue.js
    App Development
    User Interface Design
    iPad App Development
    Mobile UI Design
    Kotlin
    Swift
    Flutter
    React
    Node.js
    iOS Development
    Mobile App Development
    Android
  • $38 hourly
    • 5.0/5
    • (58 jobs)
    My main responsibilities include the coordination and completion of projects on time within budget and within scope. Oversee all aspects of projects. Set deadlines, assign responsibilities, and monitor and summarize the progress of the project. Prepare reports for upper management regarding status of the project. I have a strong understanding of Agile methodology. Excellent skills in correspondence, documentation, handling project milestones, financial planning, and execution. Experienced in data visualization, reports, and analytics. List of duties: 1) Communication with customers 2) Project initialization 3) Project planning 4) Managing cross-functional teams 5) Managing project budget and deadline 6) Task and bug tracking with Redmine, JIRA, Trello, GitHub, Basecamp 7) Creating UI specifications 8) Team motivation 9) Project requirements capture and analysis
    Featured Skill Android App Development
    Software QA
    iOS Development
    Swift
    Node.js
    PHP
    JavaScript
    Java
    AngularJS
  • $44 hourly
    • 5.0/5
    • (22 jobs)
    What is this secret ingredient to make the job done? For me it is an Attitude. And by Attitude I mean 4 key principles I follow with my team: 🧑‍💻 Technology. We believe that technology is a means to achieve business goals rather than an end in itself. With a strong emphasis on purposeful development, we take complete responsibility for the technological aspect of every project. 🎯 Shared goals. What can compare to watching your baby grow and succeed? We prefer working with companies and startups in a long term, driving their growth with solutions we deliver. 🤗 Care. By understanding your goals in business, we are involved in decision making process on the tech side, and constantly discuss and evaluate solutions we are building to meet these goals. That what partners do. 🌊 Transparency: Sometimes problems happen. Trust me, telling your client about a problem is not the most pleasant thing. We believe that being transparent in these situations allows to make timely decisions, and makes a solid foundation for partnership. Most of my projects are in following domains: Utilities Healthcare and HIPAA projects SaaS platforms Asset management software Social and Media My expertise: Mobile app development ► Cross-platform mobile apps ► Native mobile apps for iOS and Android ► Apps for IoT with BLE (Bluetooth Low Energy) ► Apps for Crypto / Blockchain and NFT niche Tech stack: React Native, Swift, Kotlin and Java, SwiftUI, BLE (Bluetooth Low Energy). Web development ► SaaS platforms ► Web applications and tools ► Admin panel Tech stack: React.js, Django Templates, Flask, Typescript, Javascript, Python Tools: Figma, Sketch, Adobe Photoshop
    Featured Skill Android App Development
    iOS
    Firebase
    JavaScript
    Smartphone
    SwiftUI
    Swift
    React
    React Native
    Database
    Python
    Web Development
    Mobile App Design
    iOS Development
    Mobile App Development
  • $35 hourly
    • 4.9/5
    • (22 jobs)
    🕘 𝟳+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 experience as a certified iOS | iOS Mobile App Developer | iOS Developer 🏆 𝗨𝗽𝗪𝗼𝗿𝗸 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝟭𝟬𝟬% 𝗝𝗦𝗦 🥇 𝗠𝗼𝗿𝗲 𝘁𝗵𝗮𝗻 𝟯𝟴𝟬𝟬 𝗵𝗼𝘂𝗿𝘀 𝗼𝗳 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸 🎯 𝟮𝟭 𝗷𝗼𝗯𝘀 𝗱𝗼𝗻𝗲 𝗼𝗻 𝗨𝗽𝗪𝗼𝗿𝗸 💲 𝟭𝟬𝟬𝗸+ 𝗲𝗮𝗿𝗻𝗲𝗱 𝗼𝗻 𝗨𝗽𝗪𝗼𝗿𝗸 🔥 𝗔𝘀 𝗮 𝗙𝗨𝗟𝗟-𝗧𝗜𝗠𝗘 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, 𝗜 𝗰𝗮𝗻 𝗮𝘀𝘀𝗶𝘀𝘁 𝘄𝗶𝘁𝗵 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝟯𝟬+ 𝗵𝗼𝘂𝗿𝘀 𝗮 𝘄𝗲𝗲𝗸! 👋 Hello, I'm Valentyn, and I've been working as a developer for 7+ years 🚀 specializing in mobile software solutions with expertise in Mobile App Developer | Swift | React Native | Node.js | iOS Android. I have a strong background in process-oriented engineering and can excel both in team environments and as a solo developer. My goal is to deliver effective and elegant solutions for your technical challenges, whether you're Seeking a Swift | React Native Developer or looking for Experienced Full-Stack/Back-End expertise. ✍ My expertise covers a wide range of technologies and stacks, which makes me a suitable choice for projects requiring a Senior Swift | React Native Engineer, SaaS Development, or even if you're Looking for a Full Stack Developer. ⚡ Mobile Application Development: ✅ Hybrid / Cross-Platform Mobile apps using React Native CLI / Ionic and Redux ✅ Native Mobile Applications for iOS and Android, including iOS App Development for MVPs ✅ Progressive Web Applications (PWAs) using React.js ✅ Expertise in React Native App Development as a Talented React Native Developer ✅ Mobile Apps and Native App Development for both iOS and Android platforms ⚡ Web Application Development: ✔ Full Stack Development, covering Front-end and Back-end ✔ MVP Development, including Website MVP and SaaS solutions ✔ Proficient in building robust Web Apps with a focus on scalable and efficient architecture ✔ Webapp Developer services tailored to meet the needs of startups and enterprises alike ⚡ Front-end Development: ✔ Proficiency in TypeScript, React.js, iOS, Android, Smartphone, Mobile App Development, Swift, iOS Development, User Profile Creation, Flutter, React Native, User Authentication, JavaScript, In-App Purchases, Android App Development, Firebase and Node.js ✔ Experience as a UI/UX Designer and UI/UX Framer Designer, focusing on delivering intuitive and engaging user experiences ✔ Figma expertise for designing wireframes and prototypes to ensure visual consistency and usability ⚡ Back-end Development: ✔ Expertise in Node.js (TypeScript), Express.js, Nest.js, with capabilities for handling complex back-end logic ✔ Building and integrating RESTful APIs for seamless data exchange in web and mobile applications ✔ Experience in MVP SaaS and SaaS Application back-end development ⚡ Database Expertise: ✔ Mastery in managing databases like MongoDB, PostgreSQL, and Firebase for reliable and scalable storage solutions ✔ React Native Firebase expertise for real-time data handling and user authentication 🎯 I am a dedicated and experienced Swift | React Native Expert and Full Stack Developer who specializes in developing exceptional mobile applications. My passion for creating efficient, user-friendly apps, combined with a strong background in UI/UX design, MVP App Development, and database management, ensures that I deliver high-quality solutions that exceed client expectations. Whether you're Looking for a developer or need an Experienced UX/UI Designer for your SaaS project, I'm here to help. 👉 When you collaborate with me, you can expect: ✔ Market-competitive mobile app development services ✔ Exceptional and reliable communication tailored for clients Seeking Expert Mobile App Developer ✔ Daily project reports and status updates to keep you informed ✔ Immediate responsiveness to queries and concerns I am here to assist with your development needs, whether you're in search of an Experienced iOS Mobile Developer for iOS App Buzzwords: Fintech application Fintech Platform Banking App iPhone + Android Developer team B2B SaaS application AI-based Healthcare Web Platform Full stack development team Developing an MVP EduTech Website App Developer Expertise in iOS and Android Driver App Planning, developing, and maintaining web and mobile applications Build an app Looking for a developer Full stack developer Like social app Development Agency Needed Cross-Platform Real Estate App Health mobile app Seeking Expert Developer/Agency Rewards Platform Food Delivery app Food Trucks Need mobile app Innovative app Proof of Concept (POC) Financial wellness / banking platform Education Training mobile app Website Dashboard Development and enhancement Scalable digital solutions In-app purchases Tourism Platform AI Integration Navigation app Geolocation app Location-based app Wellness EdTech Nutrition and training Dating App Childcare Task/ticketing system Booking App Chrome extension Long term Minimum Viable Product Development from scratch Need a full stack team
    Featured Skill Android App Development
    In-App Purchases
    User Authentication
    User Profile Creation
    JavaScript
    Android
    iOS Development
    iOS
    Firebase
    Flutter
    React Native
    Swift
    Mobile App Development
    Smartphone
    Node.js
  • $45 hourly
    • 5.0/5
    • (60 jobs)
    With over 9 years of experience as a Mobile Developer, I bring to each project: ✓ Steadfast Commitment to Quality: Upholding the principle that excellence is the only standard, I approach every project with meticulous care and precision, ensuring outcomes that are not just completed, but masterfully executed. ✓ Passion for New Technologies: My enthusiasm for innovation drives me to continuously explore and integrate the latest trends and advancements in mobile development, keeping my solutions at the forefront of technology. ✓ Holistic Approach: Balancing innovation with reliability, I deliver projects that exceed client expectations, merging cutting-edge technology with dependable performance to create impactful solutions. ✓ Drive for Challenges: The dynamic and ever-evolving landscape of mobile development fuels my pursuit of new challenges and opportunities. Leveraging my extensive skills, I strive to make a significant difference in the mobile technology sphere, pushing boundaries and contributing to projects that set new benchmarks.
    Featured Skill Android App Development
    Android UI Design
    RESTful API
    Google Maps API
    JSON
    Core Java
    XML
    Android SDK
    iOS Development
    Swift
    Kotlin
    iOS
    Android
    Java
    Firebase
  • $45 hourly
    • 5.0/5
    • (25 jobs)
    I can develop any kind of mobile application for you. My primary skill is Android development, and I can gather a team of professionals to cover all aspects of application development, including backend, design, iOS, and frontend. I have developed more than 30 apps, and all of my clients are satisfied with the results. My stack ✔Kotlin, Java ✔Clean Architecture, MVVM, MVP ✔Jetpack, Coroutines, Dagger2/Hilt, Room, Retrofit, Glide, Firebase, Payments Tools I use: ✔Android Studio ✔Sketch, Adobe Photoshop, Figma, Adobe Illustrator Have any questions? Want to discuss your projects? Feel free to contact me and have a nice day! :-)
    Featured Skill Android App Development
    XML
    Android SDK
    Dagger 2
    Android
    Firebase Cloud Firestore
    JetPack
    Android Room Persistence
    Multithreaded Programming
    Push Notifications
    Retrofit
    Firebase
    SQLite
    Kotlin
    Java
    Android Studio
  • $40 hourly
    • 4.9/5
    • (33 jobs)
    I'm a part of a skilled Android and iOS development team based in Ukraine, right in the heart of Europe. Our strengths: ✔️ Proficient in Android, iOS, and Flutter development ✔️ Full project management from inception to delivery ✔️ Commitment to transparent and consistent communication Our Expertise: We specialize in developing high-load native apps, VoD/HLS video platforms similar to YouTube, Social networks, Dynamic Chats, Cashback solutions, Cryptocurrency integrations, and E-commerce ecosystems. Our passion lies in refining UI/UX, intricate animations, seamless user flows, and top-notch performance. We invest extensive hours to ensure our apps achieve the level of finesse you'd expect from industry giants like Google and Netflix, if not more. Your vision, our expertise. Our workflow: - Design: Zeplin, Sketch, Figma, Photoshop - Project Management: Trello, Jira, Slack, Skype - Analytics: Crashlytics, Firebase, Matomo - Development: Bitbucket, Java, Kotlin, Swift, Flutter, React Native, Angular, Svelte, SvelteKit, Solid.js, Astro - Preferred architectural patterns: MVP/MVVM. Keywords: Android, iOS, Flutter, project management, UI/UX, animations, high-load apps, VoD, HLS, video platforms, social networks, Cashback, cryptocurrency, e-commerce, Java, Kotlin, Swift, MVP, MVVM, Svelte, SvelteKit, Solid.js, Astro
    Featured Skill Android App Development
    Svelte
    Android App
    Apple Watch
    Chat & Messaging Software
    Native App Development
    User Profile Creation
    Tablet
    iOS
    Smartphone
    Flutter
    Mobile App Development
    iOS Development
    Kotlin
    Swift
  • $40 hourly
    • 4.9/5
    • (11 jobs)
    🇺🇦 🤝 Struggling to find a reliable native app team? Let’s build your app – fast, secure & scalable! Top Rated | 8+ Years in Mobile App Development | 50+ Projects | 30+ Reviews | 100% Job Success 💪 We’re NATIFE, a senior-level team in Mobile App Development, focusing on native solutions with Swift and Kotlin. From MVPs to large-scale ecosystems – we’ve helped 50+ clients grow their businesses through effective Mobile App Development tailored to real market needs. 🚀 Why clients choose us: 1. End-to-end Mobile App Development ✔️ Full-cycle Mobile App Development for iOS & Android using SwiftUI, Jetpack Compose, HealthKit, GPS, NFC, and more. ✔️ Our Mobile App Developers strictly follow App Store Guidelines, ensuring smooth publishing and updates. ✔️ Specialized in TV & Watch apps, IPTV/OTT, and wearable devices – true native Mobile App Development beyond smartphones. 2. Backend & cloud excellence for Mobile ✔️ Scalable backends with Node.js, MongoDB, Firebase, AWS, GCP – all tailored for high-performing mobile app development. ✔️ Enterprise-grade security: Biometric authentication, Keychain Storage, Mobile App Developer tools for secure codebases. ✔️ Complex integrations (Stripe, Blockchain, Chat, Voice Assistants) built for modern mobile app infrastructures. 3. Fast delivery & agile process ✔️ We reduce time-to-market by 30–50% through optimized Mobile App Development pipelines, CI/CD (Fastlane, GitLab, Bitrise), and code reuse. ✔️ Agile-based teamwork (Scrum, Kanban) with TDD and thorough testing on real devices for bulletproof mobile releases. ✔️ Our Mobile App Developers excel in dynamic feature delivery, updates via App Store Connect & Play Console. 4. UI/UX That Converts in Mobile ✔️ Intuitive, inclusive design via Figma, Adobe XD, Sketch – essential in every Mobile App Development stage. ✔️ WCAG-compliant interfaces, A/B testing, user retention optimization = happy users. ✔️ We deliver interfaces your customers love – thanks to experienced Mobile App Developers who care about user experience. 📲 Industries we’ve powered with Mobile App Development: ✔️ Fintech, Health & Wellness, Meditation, Beauty, Fitness, Telemedicine, Logistics, Shopping, Hotel & Restaurant, Audio/Streaming, E-commerce, Real Estate, Social & Messaging, Mobile Games, Blockchain, NFTs ✔️ Our Mobile App Developers understand industry-specific challenges and offer smart, scalable mobile solutions using best practices in Mobile App Development. 🔧 We handle all aspects of Mobile App Development: security, performance tuning, testing (TestFlight, emulators), version control (GitHub, GitLab), and project tracking (Slack, Asana). ⏳ Let’s talk about your Mobile App Development needs. Our Mobile App Developers are ready to jump in. First consultation – free! 📩 Message us now and see how great Mobile App Development can be when done right.
    Featured Skill Android App Development
    Mobile App Bug Fix
    watchOS
    SwiftUI
    Mobile App
    Android SDK
    Native App Development
    iOS SDK
    AI App Development
    iOS Development
    Mobile App Development
    iOS
    Android
    Swift
    Kotlin
  • $40 hourly
    • 5.0/5
    • (12 jobs)
    Hello There! I am senior software engineer with 7 years of experience in iOS/Android app development. I can provide solution for cross-platform app development with Xamarin and React Native. My skills: ✔ React Native (JavaScript/ES6/7, Redux, Redux-Saga, Redux-Thunk) ✔ Xamarin (C#, Xamarin.Forms, Xamarin.iOS, Xamarin.Android, Xaml, MvvmCross, FreshMvvm, Prism) ✔ Ionic ✔ iOS (Swift, Objective-C) ✔ Android (Java) I provide: ✔ Excellent software architecture skills, with the ability to develop well-structure code. ✔ Experience integrating with third party libraries and APIs. ✔ Good comprehension of UI/UX, including Android Material and iOS Design guidelines. ✔ Solid understanding of the mobile development life cycle. ✔ Proven track record of publishing apps to App Stores. ✔ Action-oriented, with strong initiative and the ability to solve problems creatively When dealing with customers I try to clarify necessary details concerning the project, estimated time for implementation.
    Featured Skill Android App Development
    API Development
    Next.js
    Cross Browser & Device Compatibility
    Front-End Development
    Mobile App Development
    iOS Development
    Node.js
    JavaScript
    Ionic Framework
    Firebase
    React Native
    Xamarin
    C#
    Hybrid App Development
  • $30 hourly
    • 5.0/5
    • (7 jobs)
    👋 Greetings! With over 1️⃣5️⃣ years of extensive experience in iOS and Android Mobile App Development, I bring a unique blend of design, development, and technical leadership to every project. 🎓 M.S. in Computer Programming, with expertise across multiple development stacks. ⭐️ Hundreds of 5-star reviews! 🎯 100% Job Success on platforms like Upwork and beyond! 🚀 I am a full-cycle mobile developer, taking your project from an initial 💡 idea to a fully functional 📱 mobile application. I handle everything from UI/UX design to backend API integration, ensuring a seamless experience from start to finish. Whether it’s native iOS development with SwiftUI or Android development using Kotlin or Java, I am here to build high-quality apps. 👉 Contact me today for a free project consultation, and let’s discuss how we can bring your mobile app vision to life! Technologies and Tools: ✅ Native iOS Development: Swift, SwiftUI, Objective-C, Core Data, Core Animation, XCTest ✅ Native Android Development: Java, Kotlin, Jetpack Compose, Room Database, Retrofit, Dagger, Coroutines ✅ Cross-Platform Development: Flutter, React Native, leveraging Dart and JavaScript for hybrid mobile apps. ✅ Backend Integration: Firebase, REST APIs, GraphQL, Node.js, Python, AWS, Azure, Google Cloud ✅ Databases: MySQL, PostgreSQL, MongoDB, Redis, Cassandra, Firestore, SQLite ✅ Version Control: GitHub, GitLab, Bitbucket, SVN ✅ CI/CD Tools: Jenkins, GitHub Actions, GitLab CI, CircleCI, Bitbucket Pipelines, Docker, Kubernetes ✅ Testing & Automation: TDD, BDD, Unit Testing, XCTest, Espresso, Selenium, Appium, JUnit ✅ Cloud Services: AWS Lambda, Azure Functions, Google Firebase, AWS EC2, S3, DynamoDB, CloudFront, CloudFormation ✅ DevOps: Kubernetes, Docker, Terraform, Ansible, Puppet, Chef, Jenkins, CircleCI ✅ API Development & Integration: RESTful APIs, GraphQL, OAuth, OpenID Connect, Third-Party SDK integration ✅ Payment Gateway Integration: Stripe, PayPal, Braintree, Razorpay, Apple Pay, Google Pay Areas of Expertise: 💪 I specialize in creating scalable mobile apps with microservices architecture and event-driven designs that can handle high traffic and scale seamlessly. My focus on app optimization ensures that both iOS and Android apps run efficiently, providing users with the best experience possible. Featured App Development Projects: 📦 Food and Retail Delivery Platforms: Fully customized solutions for drivers, staff, and customers, including real-time tracking, push notifications, and in-app payments. 👥 Social Media Apps: Building feature-rich platforms with chat, feeds, profiles, push notifications, user authentication, and real-time updates. 🔄 E-commerce and Marketplace Solutions: Complex buy/sell platforms with secure payment gateways, commission structures, inventory management, and smooth customer experiences on mobile. 📊 Productivity Apps: Designing and developing task management and expense management apps for cross-platform use, utilizing Flutter and React Native for seamless integration across devices. 🌟 I turn ideas into high-performing, market-ready mobile apps with a keen eye on user experience and performance optimization. Whether you need a native iOS app or a cross-platform solution with Flutter or React Native, I’m here to help. Let’s collaborate to make your app the next big thing on the Apple App Store and Google Play Store! ⚡️ Updated portfolio: February 28, 2025
    Featured Skill Android App Development
    User Authentication
    User Profile Creation
    Tablet
    Smartphone
    JavaScript
    Mobile App Development
    Android
    iOS
    Flutter
    iOS Development
    React Native
    Xamarin
    Swift
    Kotlin
  • $35 hourly
    • 2.9/5
    • (2 jobs)
    🎯 I am Andrew, a skilled React Native expert IOS and Android developer with 5 years of experience in React Native and 6+ years of experience in programming. I have a list of successful completed projects 🎯 I'm also presenting my mobile applications development team, Join.To.IT from Kyiv, Ukraine. We have multiple mobile application developers, working with React Native and React.js. We are experts in our area of business. Our team has already worked with such industries as: ✔️ ChatGPT integration ✔️ Social media ✔️ Healthcare ✔️ Manufacturing ✔️ Education ✔️ Automotive ✔️ Finance ✔️ Legal ✔️ Sales ✔️ Sport Stack of technologies: ➕ React Native; ➕ ReactJS ➕ Redux; ➕ NodeJS; ➕ Yarn; ➕ Firebase; ➕ MySQL; ➕ API development (PHP - Laravel, Node.js, Python); ➕ API integrations (Stripe, Pay Pаl, Twilio, TextMagic, Xero, DocuSign, Google maps and other maps, Facebook, Twitter, Instagaram, Hellosign, etc.); ➕ Prettier; ➕ Storybook; We have bright projects, that are successful startups. Please contact me for further details and fruitful work. Send a request for a free project quote now! Best Regards, Andrew
    Featured Skill Android App Development
    Next.js
    Node.js
    Redux
    Material UI
    iOS Development
    Mobile App Development
    React
    ChatGPT
    Hybrid App Development
    React Native
    JavaScript
    HTML
    CSS
    TypeScript
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