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Rajat K.
$17.3/hr
100% Job Success
$100K+ earned
Available now
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I build mobile apps that thousands of people actually use. React Native, Flutter, and modern backends for iOS and Android. 10+ years in, 6,500+ hours on Upwork, 100% Job Success, Top Rated. Whether you're launching an MVP or scaling an app that's outgrowing its codebase, I take it from idea to the App Store and Google Play. What I build: - Cross-platform apps on React Native and Flutter - AI-integrated mobile experiences (chat, vision, personalization) using Azure OpenAI and LLM APIs - Marketplace, on-demand, and booking apps - Firebase and Supabase backends - MVPs built fast, structured to scale Tech: React Native, Flutter, iOS, Android, Firebase, Node.js, .NET, AWS, MongoDB, PostgreSQL, TypeScript. Common problems I solve: • Need to launch quickly → I build production-ready MVPs fast • Poor app performance → I optimize speed and stability • Outdated UI/UX → I create modern, user-friendly mobile experiences • Scaling challenges → I build apps designed for growth Send me your app idea and I'll come back with a clear build roadmap.
Rajat K. has worked .
QServices IT Solutions
Associated with
QServices IT Solutions
$1M+
earned
Neelam R.
$35/hr
100% Job Success
$50K+ earned
Available now
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𝙈𝙤𝙨𝙩 𝙖𝙥𝙥𝙨 𝙛𝙖𝙞𝙡 𝙣𝙤𝙩 𝙗𝙚𝙘𝙖𝙪𝙨𝙚 𝙤𝙛 𝙗𝙖𝙙 𝙞𝙙𝙚𝙖𝙨 - 𝙗𝙪𝙩 𝙗𝙚𝙘𝙖𝙪𝙨𝙚 𝙤𝙛 𝙗𝙖𝙙 𝙚𝙭𝙚𝙘𝙪𝙩𝙞𝙤𝙣. I'm Neelam, a mobile and web app developer specializing in AI-powered applications, native iOS and Android, and cross-platform apps in React Native and Flutter. I hold a 100% Job Success Score and Top Rated status on Upwork, backed by 10+ years building products — much of it outside this platform. I don't just write code. I think through your product, challenge weak assumptions early, and build things that hold up in the real world. My edge? I've shipped across enough domains — health, fintech, social, ecommerce, sports, media, edtech — to know what works before the first line of code. My sharpest focus right now is AI-powered mobile and web apps: products that don't just look smart, but genuinely behave that way. WHAT I BUILD ➜ AI & Intelligent Apps — LLM integrations, automation pipelines, OpenAI, custom AI workflows ➜ Native Android — Kotlin | Java | Android Studio ➜ Cross-Platform — React Native | Flutter | FlutterFlow ➜ Web — React.js | Next.js | HTML/CSS ➜ Backend & APIs — Python (FastAPI, REST) | Node.js | Express.js ➜ Database & Cloud — PostgreSQL | MongoDB | Firebase | AWS | Google Cloud | Azure ➜ AI-Assisted Development — Claude Code, Cursor, Windsurf, GitHub Copilot, Replit, Lovable WHAT WORKING WITH ME LOOKS LIKE No ghosting. No vague updates. No surprises at the finish line. I follow Agile Scrum, communicate proactively, and treat your deadline like it's mine — because my reputation depends on it. Need more firepower? When a project calls for it, I can scale up with a dedicated senior team — same standards, more bandwidth, with my oversight at every stage. If you're serious about building something that works, hit "Invite Now" and let's talk.
Vinay D.
$20/hr
100% Job Success
$60K+ earned
Available now
Offers consultations
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I build high-performance mobile apps using Flutter and React Native, with a strong focus on AI-powered features, BLE integrations, and connected IoT devices. With 8+ years of experience, I help businesses turn complex ideas into scalable, production-ready mobile solutions for iOS and Android. My clients stay long-term because I don’t just build apps, I build reliable systems that perform in real-world conditions, including hardware-connected and AI-enhanced mobile experiences. My Tech Stack Expertise: ✅ Hybrid App Development: - Flutter (cross-platform apps with seamless performance) - React Native (robust and scalable apps for iOS and Android) ✅ AI Integration in Mobile Apps: - AI chatbots and assistants inside apps - OpenAI / LLM integrations for smart features - AI-based automation, recommendations, and data processing - On-device + cloud AI workflows ✅ Native App Development: - Android: Kotlin, Java - iOS: Swift, Objective-C ✅ Backend and API Integration: - RESTful APIs, GraphQL, Firebase - Backend support with Node.js ✅ Tools and Technologies: - Xcode, Android Studio, VS Code - CI/CD pipelines with Jenkins, GitHub Actions ✅ Performance Optimization: - App profiling and debugging to ensure smooth performance - Optimizing memory and battery consumption ✅ Cloud and DevOps: - Firebase (Authentication, Realtime Database, Push Notifications) - AWS and Google Cloud Integration Industries I’ve Worked With: - Health & Fitness: Built fitness tracking apps with real-time analytics and wearable device integrations. - E-commerce: Developed feature-rich shopping apps with payment gateway integrations. - Education: Created interactive e-learning platforms with gamification features. - Travel & Hospitality: Designed booking apps for flights, hotels, and travel itineraries. - Real Estate: Built property management apps with 3D visualization and search features. - Social Networking: Developed apps with social feeds, messaging, and video-sharing capabilities. - Food Delivery: Crafted apps for food ordering, delivery tracking, and subscription models. Why Choose Me? I focus on creating mobile apps that not only meet but exceed user expectations. Whether it's building an app from scratch, upgrading an existing one, or optimizing for better performance, I bring a results-driven approach to every project. Let’s turn your app idea into a reality. Reach out today, and let’s collaborate to build something amazing!
Vinay D. has worked .
ULTIVIC PVT LTD
Associated with
ULTIVIC PVT LTD
$1M+
earned
Puneet  S.
$15/hr
96% Job Success
$800+ earned
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𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 𝐀𝐩𝐩 𝐋𝐚𝐮𝐧𝐜𝐡 & 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐬𝐭 I help 𝐬𝐭𝐚𝐫𝐭𝐮𝐩𝐬 𝐚𝐧𝐝 𝐟𝐨𝐮𝐧𝐝𝐞𝐫𝐬 𝐟𝐢𝐧𝐢𝐬𝐡, 𝐩𝐨𝐥𝐢𝐬𝐡, 𝐚𝐧𝐝 𝐬𝐮𝐜𝐜𝐞𝐬𝐬𝐟𝐮𝐥𝐥𝐲 𝐥𝐚𝐮𝐧𝐜𝐡 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 𝐚𝐩𝐩𝐬 for iOS and Android, Specialized in 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 𝐂𝐋𝐈, 𝐓𝐲𝐩𝐞𝐒𝐜𝐫𝐢𝐩𝐭-𝐛𝐚𝐬𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐚𝐩𝐩𝐬, 𝐔𝐈 𝐫𝐞𝐟𝐢𝐧𝐞𝐦𝐞𝐧𝐭, 𝐟𝐞𝐚𝐭𝐮𝐫𝐞 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐢𝐨𝐧, 𝐚𝐧𝐝 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 𝐬𝐮𝐛𝐦𝐢𝐬𝐬𝐢𝐨𝐧 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠 𝐓𝐞𝐬𝐭𝐅𝐥𝐢𝐠𝐡𝐭 and release builds. If your app is 80–90% complete but not ready for launch, I step in to finalize, optimize, and ship it properly. Many React Native projects reach 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐢𝐨𝐧 𝐛𝐮𝐭 𝐬𝐭𝐫𝐮𝐠𝐠𝐥𝐞 𝐰𝐢𝐭𝐡 𝐭𝐡𝐞 𝐟𝐢𝐧𝐚𝐥 𝐬𝐭𝐚𝐠𝐞 𝐔𝐈 𝐩𝐨𝐥𝐢𝐬𝐡, 𝐞𝐝𝐠𝐞-𝐜𝐚𝐬𝐞 𝐛𝐮𝐠 𝐟𝐢𝐱𝐞𝐬 , onboarding flow improvements, performance optimization, release configuration, and store submission. That final 10–20% is where I specialize. 💼 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 React Native CLI (not Expo-only builds) React Native with TypeScript iOS & Android production development Pixel-perfect UI implementation from Figma UI polish & premium UX refinement Feature completion & code refactoring REST API integration (JWT, OAuth, Bearer authentication) React Navigation (Stack, Tabs, Deep Linking) Secure authentication & token handling Performance optimization & debugging TestFlight configuration & App Store submission Google Play release & deployment 📱 𝐢𝐎𝐒 𝐑𝐞𝐥𝐞𝐚𝐬𝐞 & 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 Hands-on experience with: Xcode release builds & archive configuration Provisioning profiles & signing certificates App Store Connect setup TestFlight beta distribution App Store review process & rejection resolution Production deployment workflow 🛠 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐭𝐚𝐜𝐤 React Native 0.7x / 0.8x TypeScript React Navigation Firebase Supabase / PostgreSQL Node.js / REST APIs Push Notifications CI/CD mobile pipelines 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐂𝐚𝐧 𝐄𝐱𝐩𝐞𝐜𝐭 Clean, maintainable production-ready code Clear communication & fast response Strong attention to performance & stability 𝐎𝐧-𝐭𝐢𝐦𝐞 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 Focus on real-world launch success I don’t just build mobile apps I help you ship stable, scalable React Native products ready for real users. If you need a React Native developer who understands launch, release builds, and production deployment let’s connect.
Puneet S. has worked .
CodeMantra Solutions
Associated with
CodeMantra Solutions
$100K+
earned
Ahsen S.
$20/hr
100% Job Success
$80K+ earned
Available now
Offers consultations
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Need a Mobile App that actually scales, performs, and feels right to users? You’re in the right place. I’m a senior mobile developer with 8+ years of experience building 60+ production apps across fintech, e-commerce, healthcare, logistics, and on-demand platforms. I work primarily in Flutter and Kotlin, crafting clean, maintainable architectures and smooth user experiences that hold up in real-world usage. Here’s what I bring to your project: • Scalable mobile architecture (MVVM, Clean Architecture) • High-performance Flutter & native Android (Kotlin) apps • REST/GraphQL API integration & complex data flows • Real-time features (WebSockets, Firebase, push notifications) • Payment, maps, location, and 3rd-party SDK integrations • CI/CD, automated builds, Play Store/App Store releases • Leading remote teams & owning delivery end-to-end I don’t just code features — I help shape reliable mobile products. If you want someone who can translate ideas into polished, shipped apps (without hand-holding), let’s talk.
Ahsen S. has worked .
Sukhmander Deep S.
$45/hr
100% Job Success
$40K+ earned
Available now
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I build mobile apps that real users actually love, React Native, Flutter, Swift, and Kotlin apps shipped to the App Store and Google Play, with AI-powered features that set them apart from the competition. With a 100% Job Success Score, and 10+ years building production mobile apps across iOS and Android, I bring technical depth and product thinking to every engagement. ────────────────────────────── What I Build ────────────────────────────── → React Native & Flutter cross-platform apps : single codebase, truly native feel, shipped to both App Store and Google Play on schedule → AI-powered mobile features : GPT-4, Claude, and Gemini integrations; on-device ML, smart recommendations, AI chatbots, and agentic workflows embedded directly into your app → Backend & API integration : REST APIs, Firebase, Supabase, and custom backend connections; your app talking cleanly to everything it needs to → Payments, auth & social logins : Stripe, Apple Pay, Google Pay, OAuth, biometric authentication, and social sign-in done right the first time → Location, maps & push notifications : Google Maps, MapKit, geofencing, and real-time push notification systems for apps that need to stay connected → App Store & Google Play publishing : end-to-end submission, metadata optimisation, screenshot design, and rejection resolution so your app actually goes live → Bug fixing, performance & UI/UX : crash fixes, slowdown diagnosis, user flow improvements, and clean code refactoring for apps that already exist ────────────────────────────── Selected Projects ────────────────────────────── KeyLess : IoT-based smart access app (iOS & Android) that replaces physical keys with your smartphone. Built Flutter front-end with BLE (Bluetooth Low Energy) communication to door hardware, real-time lock/unlock controls, multi-property management dashboard, and role-based access for guests and staff. Deployed to App Store and Google Play with zero-downtime hardware pairing flow. POS System : native mobile point-of-sale built in Swift (iOS) and Kotlin (Android) for a retail client requiring offline-first architecture. Features include barcode scanning, real-time inventory sync, Stripe terminal integration for card payments, staff management with role permissions, and end-of-day reporting dashboard. Works fully offline and syncs automatically when connectivity is restored. Wellness Booking App : full-stack React Native app for a wellness services marketplace connecting clients with providers across iOS and Android. Built real-time appointment booking engine, provider availability calendar, Stripe payment integration with refund handling, push notification reminders, and a dual-dashboard for both clients and service providers. Shipped to both stores on schedule and within budget. ────────────────────────────── Tech Stack ────────────────────────────── React Native · Flutter · Swift · Kotlin · iOS · Android · Firebase · Supabase · REST APIs · GraphQL · Stripe · Google Maps · MapKit · OpenAI API · LangChain · TensorFlow Lite · Core ML · Redux · Docker · CI/CD · App Store Connect · Google Play Console ────────────────────────────── Why Clients Choose Me ────────────────────────────── I'm not just a developer for hire. I think about your app the way a product owner would. That means understanding your users before writing a single line of code, flagging UX problems before they become expensive fixes, and delivering an app that your team can maintain and grow long after launch. Clients extend projects with me because I stay committed to the outcome, not just the deliverable. 100% Job Success · Top Rated · $40K+ earned Ready to build something your users will actually love? Send me a message with your app idea or existing codebase and I'll respond with a clear breakdown of approach, timeline, and cost.
Sukhmander Deep S. has worked .
iByte Infomatics Pvt. Ltd.
Associated with
iByte Infomatics Pvt. Ltd.
$200K+
earned
Sakinder S.
$18/hr
100% Job Success
$80K+ earned
Available now
Offers consultations
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I help startups, entrepreneurs, and businesses build high-quality mobile and web applications that are scalable, user-friendly, and built for growth. As a Top-Rated Full-Stack Developer with 6+ years of experience, I specialize in Flutter, Node.js, React, Firebase, and AI-powered solutions. Whether you need an MVP, a production-ready application, or new features added to an existing product, I can help you deliver faster while maintaining clean, maintainable code. ✅ What I Can Help You Build: Flutter Mobile Apps (iOS & Android) Cross-Platform Applications Full-Stack Web Applications Node.js & Express.js Backends Firebase & Cloud-Based Solutions AI Chatbots & AI-Powered Features Real-Time Chat Applications Payment Gateway Integration (Stripe, PayPal, Razorpay) Map & Location-Based Applications Push Notifications NFC & IoT Solutions REST API Development & Integration ✅ Technologies: Flutter React & Vue.js Node.js & Express.js Firebase MongoDB PostgreSQL MySQL TypeScript JavaScript ✅ Industries Served: Healthcare & Telemedicine E-commerce & Marketplaces Real Estate Platforms Social Networking Applications Fitness & Wellness Apps Booking & Scheduling Systems On-Demand Service Platforms Loyalty & Rewards Programs Why clients hire me: ✔ Clean and scalable code ✔ Strong communication throughout the project ✔ Reliable delivery and meeting deadlines ✔ Focus on performance, security, and user experience ✔ Long-term support and maintenance If you're looking for a developer who can turn your idea into a polished product and help your business grow, let's discuss your project.
Sakinder S. has worked .
Gsquare Web Technologies Private Limited
Associated with
Gsquare Web Technologies Private Limited
Evgenii P.
$35/hr
100% Job Success
$1K+ earned
Available now
Offers consultations
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Need a Flutter app that scales to millions of users? I build cross-platform mobile products: iOS, Android, FinTech wallets, AI-powered tools that ship fast and grow revenue. FxPro: 15M+ users, multiple international awards. What sets me apart is the rare combination of Flutter depth and full-stack reach. I've architected apps from a 3-month FinTech MVP (Grineo, launched 50% faster than average) to a 15M-download trading platform (FxPro). I work across Flutter, KMP, Swift, Kotlin, React, and Python — so I can own the entire product, not just one layer. Here's what I deliver: 📱 Cross-platform mobile apps - Flutter, KMP (Kotlin Multiplatform), Swift, Kotlin 🌐 Scalable web - React, Next.js, Node.js, .NET Core 🤖 AI & Computer Vision - Python, PyTorch, YOLO, real-time video analysis ☁️ Cloud & security - AWS, Docker, PCI-DSS compliance, PassKey encryption Whether you need an MVP in 90 days or a production system built for 10M+ users, I map out the architecture first so you never rebuild from scratch. 📌 FxPro - architected native mobile apps and high-load backend for a 15M+ download trading platform. Won multiple international awards. 📌 Grineo FinTech Wallet - launched secure MVP in 3 months, 50% faster than industry average, with PassKey encryption. 📌 Volga Surf Camp KMP App - increased service usage 2-4x, reduced admin workload by 3x. 📌 PPE Detection System - real-time AI safety monitoring on construction sites using YOLO and PyTorch. ⭐ 5.0 rating | Top Rated on Upwork | Certified: Flutter Development (Udemy), Full-Stack Web & Mobile (Coursera) I take on a maximum of 3 active clients at a time to give every project focused attention. Send me a message with a brief description of your project and I'll respond within a few hours with a clear next step!
Evgenii P. has worked .
Appricot.Agency
Associated with
Appricot.Agency
$1K+
earned
Rakesh Kumar R.
$30/hr
100% Job Success
$200K+ earned
Available now
Offers consultations
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I help startups and businesses build AI-powered SaaS platforms, mobile apps, and scalable web products from idea to production. With 10+ years of experience and 200+ successful projects, I specialize in MVP development, AI integration, and scaling products for real-world usage. I have worked on high-scale applications with over 10M users, along with multiple SaaS, fintech, and marketplace platforms across global markets. What I deliver: MVPs ready for funding and go-to-market AI-powered features using ChatGPT, OpenAI, and automation Scalable SaaS platforms with clean architecture Mobile apps with strong performance and user retention AI and ChatGPT expertise: OpenAI GPT-4, ChatGPT, Whisper, DALL·E AI chatbots, AI agents, generative AI SaaS LangChain, LlamaIndex, RAG pipelines Vector databases like Pinecone and FAISS Full stack development: Frontend: React, Next.js, Angular Backend: Node.js, NestJS, Python (FastAPI, Django) Databases: PostgreSQL, MongoDB Mobile app development: Flutter, React Native, Swift, Kotlin Payment integrations, subscriptions, Firebase Cloud and DevOps: AWS, Azure, Docker, Kubernetes CI/CD and scalable deployments Why clients work with me: Strong focus on business outcomes, not just code Fast MVP delivery with clear timelines Clean, scalable, and secure systems Long-term support and product thinking Best fit: Startups building AI or SaaS products Founders preparing for launch or funding Businesses scaling existing platforms If you are building something serious, I can help you plan, build, and scale it the right way.
Rakesh Kumar R. has worked .
Seraphic Infosolutions Pvt. Ltd.
Associated with
Seraphic Infosolutions Pvt. Ltd.
$100K+
earned
kapil M.
$45/hr
93% Job Success
$600K+ earned
Available now
Offers consultations
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"I don’t just write code; I build automated revenue engines." With over 10 years of experience in the Fintech and Blockchain space, I help traders and entrepreneurs automate their success. Whether you have a complex manual trading strategy or a vision for the next big Fintech app, I bridge the gap between financial theory and high-performance execution. # Custom Trading & Crypto Bots My specialty lies in transforming your specific strategy—whether it's based on technical indicators, price action, or sentiment analysis—into a 24/7 working bot. • Strategy to Bot: Send me a screenshot of your chart or a description of your strategy, and I will deliver a fully functional, backtested bot. • Arbitrage & High Frequency: Expertise in MEV, Cross-exchange arbitrage, and Grid trading. • AI Integration: Leveraging LLMs and predictive modeling to filter out market noise and improve win rates. # Proven Fintech Expertise I have developed several popular Fintech applications that are currently scaling in the market. Key projects include: • Robinhood-Style Trading Platforms: Real-time data streaming, instant order execution, and sleek UI. • Crypto Wallets (Phantom/MetaMask style): Multi-chain support (Solana, Ethereum), dApp browser integration, and high-level encryption. • Neobank & Digital Wallets: Peer-to-peer payments, automated savings, and multi-currency support (similar to Revolut). • Calcounti (Nutrition/Fintech Hybrid): Advanced AI integration for market-specific tracking and automated billing. Why Choose Me? • 10 Years in Fintech: I understand security, scalability, and compliance. • AI-First Approach: I use AI to make your apps smarter and your bots more accurate. • Result-Oriented: My goal is to help you generate consistent revenue through automation. Let’s turn your strategy into a live bot today. Click 'Invite to Job' to start the conversation.
kapil M. has worked .
Yogreet Global LLP
Associated with
Yogreet Global LLP