🟢 Enjoyed building apps for startups and mature businesses. 📱I'm an iOS developer with more than 6 years of strong experience. I have worked as software engineer and software development team leader. Accurate and well organised, always looking for best practices and efficient solutions. I believe application code should be maintainable and business behind that code should be successful. That means UI and UX also matters a lot. Here is a list of my competencies: 🌟 Programming languages: * Swift * Objective C and Java as supporting 🌟 Custom UI interfaces and animations with SwiftUI 🌟 Networking: * URLSession * GraphQL 🌟 Geolocation * ArcGIS * Apple Maps 🌟 Async programming * Combine * Structured Concurrency * GCD 🌟 Services and frameworks * HealthKit * Push Notifications * AVFoundation * MusicKit * Bluetooth Low Energy * Core Data * Apollo * Salesforce * Google Analytics * Mixpanel 🌟 App management: * AppStore Connect * TestFlight * App Center * Fastlane 🌟 Project management * Jira * Trello * Monday * Asana 🌟 Code management * GitHub * Bitbucket 🌟 Tools * Xcode * Instruments * Charles Proxy * Proxyman 🟢 In my recent applications, I have worked with such domains: - Health care, AI - Entertainment - Geolocation and risk management Years of experience allows me to implement wide range of projects for your business - from first prototype to final product. Developing applications is my passion. My goal is to bring your ideas to reality, doing the job accurately and on time. Continuously tracking guidelines, technical trends and modern solutions helps me to deliver top class products. Therefore SwiftUI development is my current focus. Let's change this world together to the better!

Hi! I’m a Senior iOS Engineer with 5+ years of experience building polished apps for iOS, macOS, watchOS, tvOS, and iPadOS. I specialize in Swift and SwiftUI, with a focus on performance, clean architecture, and smooth App Store approvals. Whether you need a full app from scratch, a SwiftUI migration, or AI integration, I’m here to help you ship faster and scale smarter. 🔧 What I Deliver ✅ Native iOS Development (Swift, SwiftUI, UIKit, Combine) ✅ Full-cycle delivery: design → code → App Store launch ✅ UIKit > SwiftUI migrations, crash reduction, tech-debt cleanup ✅ Offline-first architecture (Core Data / Realm) ✅ Firebase, REST & GraphQL API integrations ✅ Apps for iOS, macOS, tvOS, watchOS ✅ App Store Optimization (ASO), testing, CI/CD, deployment 💡 Past Results - Rebuilt and launched SwiftUI-based iOS apps for EU and US clients in categories like business, lifestyle, and utilities. - Migrated UIKit legacy codebases to SwiftUI, improving maintainability and reducing crash rates. - Developed and published apps for iPadOS, macOS, and tvOS in full alignment with Apple’s design and technical guidelines. - Integrated REST and GraphQL APIs into SwiftUI apps using testable MVVM architecture. - Helped clients pass App Store review on first submission by strictly following Apple’s HIG and privacy rules. - Added chat features and AI components using tools like OpenAI’s ChatGPT API, including basic chatbot flows and smart content generation. 🛠️ Stack & Tools Swift • SwiftUI • UIKit • Combine • Firebase • Realm • GraphQL • REST • RevenueCat Xcode 15 • Git • Figma • Jira • Postman • RxSwift • Core Bluetooth • ARKit 🌍 Communication & Availability 🇪🇺 Based in Central Europe (UTC+2) 🕓 Full EU overlap | US-friendly hours for long-term projects 📣 Daily Slack/Email + async Loom updates - no chasing progress 🤝 Why Hire Me ✅ SwiftUI-native mindset = faster delivery & better maintainability ✅ Proven results = App Store launches, crash-free apps, clean transitions ✅ Clear updates = no guesswork, no delays ✅ B2B-friendly = long-term, NDA-secure partnerships welcome 📩 Let’s get your app shipped - clean, tested, and ready for the store. Send a message or invite to job!

💡 "𝗕𝘂𝗶𝗹𝗱 𝗼𝗻𝗰𝗲. 𝗦𝗰𝗮𝗹𝗲 𝗳𝗼𝗿𝗲𝘃𝗲𝗿." I’m a Mobile App Developer (8+ years) specializing in Swift, SwiftUI, and Kotlin, helping businesses build stable, scalable, and high-performing mobile applications. ✅ iOS Development – Swift, SwiftUI, UIKit, in-app purchases, subscriptions, analytics integrations ✅ Android Development – Kotlin, Android NDK, MVVM, Material 3 UI, Retrofit, Flutter ✅ App Optimization – Crash-free, performance-driven apps with Firebase Crashlytics & advanced error handling ✅ Backend & Integrations – Supabase, Firebase, REST APIs, GraphQL, custom analytics dashboards 🔹 What sets me apart? I scope projects properly with clear milestones & realistic timelines. I’ve built subscription-based apps, productivity tools, and scalable SaaS mobile solutions. I focus on long-term partnerships. I’m already working with repeat clients on Upwork who trust me with ongoing development. 🔹 How I can help you: Build a new iOS/Android app from scratch Upgrade your existing mobile app with new features Ensure stability, performance, and scalability for long-term growth 📩 Let’s discuss how I can help you build a mobile app that’s not only functional but built to last. iOS Development | Swift | SwiftUI | UIKit | Objective-C | Android Development | Kotlin | Java | Media & Audio Technologies | Core Audio | AVFoundation | AudioKit | API Integration | REST APIs | Supabase | Firebase | Localization | Unit Testing | CI/CD | Xcode | Android Studio | Git | Mobile App Development | IOS Full Stack Solution | Startup Consultant | Top Rated Plus | Investment-Ready Products | Rapid Prototyping | Cross-Platform Development | Flutter | TestFlight | Json | Stripe

Top-Rated Plus Mobile App Development Expert (Top 10%) | 100% Job Success Score | Mobile App Design & Mobile App Development | iOS & Android Mobile App Development | Swift | Kotlin | React Native | Flutter | AI-Driven Mobile App Development | Cross-Platform Mobile App Development | 8+ Years of Experience I specialize in mobile app development, creating scalable, secure, and production-ready digital products that support business growth. My approach combines strong engineering practices, thoughtful product design, and architecture decisions focused on long-term scalability across both iOS and Android ecosystems. Beyond feature delivery, I prioritize performance optimization, reliability, and maintainable codebases that evolve with product needs. My expertise covers structured iOS mobile app development, including modern Apple ecosystem solutions powered by Swift, clean architecture principles, and high-performance engineering practices. I build scalable iOS applications using efficient workflows, optimized memory management, and production-grade Swift implementations aligned with Apple platform standards. Within Android mobile app development, I design and deliver scalable solutions across complex application environments using Kotlin and modern Android architecture patterns. My work emphasizes modular structure, stability, and long-term maintainability, ensuring applications remain adaptable as products grow. When rapid delivery or flexibility is required, I implement React Native mobile app development solutions designed for production environments. My cross-platform expertise includes hybrid application strategies, scalable cross-platform architecture, and integrations powered by React ecosystems such as React JS, React Redux, Node.js, and Firebase services. I also support projects built with Flutter mobile app development, leveraging Dart, Firebase integrations, and scalable CI/CD delivery pipelines when hybrid or cross-platform strategies align better with product goals. With strong backend awareness, I collaborate closely with engineering and product teams to connect mobile ecosystems with web platforms such as WordPress and Shopify, while supporting launch readiness and mobile growth strategies. Effective collaboration with designers and product stakeholders remains a critical part of successful mobile app development workflows. 5 star reviews! “Reliable mobile app development partner delivering stable releases - from MVP recovery to scalable production systems.” What I Bring: ✔️ 8+ years of experience delivering products through full mobile app development lifeccles, helping teams confidently move from concept to production. ✔️ Native expertise across enterprise-level iOS and Android mobile app development supported by strong architectural decision-making. ✔️ Cross-platform scalability using React Native and Flutter mobile app development ecosystems. ✔️ Advanced API integrations, Firebase workflows, authentication systems, analytics, payment gateways, and push notification infrastructure aligned with business objectives. ✔️ Product-focused collaboration mindset supporting designers, stakeholders, and engineering teams throughout development. 📱 Types of Mobile Applications I Build: • Taxi & Transportation Platforms • Booking and Scheduling Systems • Fitness & Health Applications • AI-Powered Mobile Products • Security-Focused iOS and Android Solutions • Social Media and Streaming Platforms including live streaming and video streaming ecosystems • Fintech & Payment Applications • E-commerce Ecosystems integrated with WordPress and Shopify • Business & SaaS Platforms • Wearables & IoT Solutions with watchOS, Apple Watch, WatchKit, and smart watch integrations • Delivery and Dating Applications Technologies & Skills I design scalable ecosystems combining native and cross-platform engineering approaches. Apple platform solutions rely on Swift, advanced iOS engineering practices, and optimized performance delivery. Android solutions are powered by Kotlin, modular architecture, and modern Android development standards. Cross-platform acceleration includes React Native mobile app development, hybrid architectures, and scalable mobile ecosystems supported by Flutter, Dart workflows, and production-ready delivery pipelines. My work in mobile app development also includes third-party integrations, backend coordination, wearable ecosystems such as Apple Watch and smart watch solutions, and long-term product evolution strategies. 📩 Let’s connect and build something impactful together.

I am a high agency developer, and have a CS degree. I'm always hungry to learn and grow. Here’s some of my work: Folderly (Co-Founder): $20K MRR, Took a school project to #1 in Productivity on the App Store. 1M+ downloads, 4.9-star average. Creatorly: Built the backend of an AI influencer management, tracking, and automations, and outreach platform, the system behind Folderly’s marketing success. PushTraining (Mobile Engineer) : $30K MRR, Worked part-time with the founder (former Google, Airbnb) to build the #1 treadmill running app fully dedicated to interval runs. FishVerify (Lead Mobile Developer): $40K MRR. The first fish app in the world before AI. Uses machine learning, tensor flow, AR Kit and now transitioning to the AI world. Winning Record: Won Apple’s Swift Student Challenge (2023) 4× consecutive national hackathon winner I won Apple’s Swift Student Challenge in 2023 without AI tools. Now I’m an AI-native developer, I use Claude Code (MCP, Claude Skills, commands, claude.md) to move faster and build better systems. Best, Lizter Angelo M. Abrau

Senior iOS Developer | Swift & SwiftUI Specialist (5 yrs) I design and build fast, reliable iOS apps with SwiftUI, Swift, MVP / MVVM / VIPER architecture, Combine, Firebase, and REST APIs. My code is clean, modular, and covered by XCTest to keep regressions near zero. Strengths 💡 Pixel-perfect UI from Figma, responsive on all devices 🔥 Performance tuning with Instruments & on-device profiling ⚡ Agile, Jira / ClickUp, Git flow & code reviews 📱 Published > 10 apps to the App Store 💬 Excellent Communication, Transparent, friendly, and responsive collaboration 🔖🔖🔖 I'm new on Upwork, and while I don’t have client history here yet, I bring 5+ years of real-world iOS development experience and a proven track record of shipping high-quality apps. I’d love the opportunity to prove myself and build long-term partnerships through great results.

🚀 Senior iOS & SwiftUI Engineer | Top Rated | 100% JSS | 42+ Apps I’m a Top Rated iOS & Mobile App Developer with 11+ years of experience building scalable, high-performance, and App Store-ready applications. I help startups and businesses turn ideas into reliable, revenue-ready mobile products using Swift, SwiftUI, Objective-C, React Native, and Flutter. Whether you need to build from scratch, fix bugs, improve performance, or scale an existing app, I deliver clean, maintainable code and clear communication from day one. ✅ Core Expertise • Native iOS: Swift, SwiftUI, UIKit, Combine • Cross-platform: React Native, Flutter • Legacy support: Objective-C • REST APIs, Firebase, Backend integrations • App Store & Play Store release support 📡 IoT, BLE & Real-Time Systems • CoreBluetooth, BLE, MQTT, WebSockets • IoT, HealthTech, Automotive, Smart Devices • Real-time data sync & low-latency communication 🧱 Architecture & Quality • MVVM, Clean Architecture, SOLID • Unit/UI tests, CI/CD, Crashlytics • Scalable, secure, production-grade code 💡 Advanced Features • Maps, GPS tracking, Geofencing • In-app purchases, Subscriptions, Push Notifications • watchOS, HealthKit, App Clips, Deep Linking • AI & Image Processing (CoreML, Vision, custom AI APIs) 🌟 Why Clients Hire Me ✔ 10+ years in mobile app development ✔ 42+ successful projects | 100% Job Success Score ✔ Top Rated with repeat & long-term clients ✔ Proven App Store & Play Store launch experience ✔ Strong in BLE/IoT, performance, and scalability ✔ Clear communication & proactive updates ✔ Faster delivery using modern AI-assisted tools 📩 Let’s build your app the right way scalable, stable, and store-ready. Send me a message and let’s discuss your project.

Senior iOS Developer with 8+ years of experience building, improving, and maintaining production-level iOS applications using Swift, SwiftUI, UIKit, and Objective-C. 🏆 Top Rated Plus (Top 3% on Upwork) ✅ 100% Job Success 💰 $90K+ Earned 📱 40+ Apps Released I help startups and businesses: • fix bugs and crashes • improve app performance • build new SwiftUI features • maintain existing iOS apps • modernize legacy Objective-C code • publish apps to the App Store My expertise includes: • Swift, SwiftUI, UIKit, Objective-C • iPhone & iPad App Development • Bug Fixing & Crash Resolution • App Maintenance & Long-Term Support • Firebase Integration • REST API Integration • Push Notifications • Google Maps & MapKit • Core Data • Authentication & Social Login • Payment Integration • App Store Submission & TestFlight • Performance Optimization • Memory Leak Fixes & Debugging • Objective-C to Swift Migration • Clean Architecture (MVVM, MVC, VIPER) • Responsive & Pixel-Perfect UI • Real-Time Features • HealthKit & ARKit • Unit Testing & Code Refactoring I focus on writing clean, maintainable, and scalable code while ensuring smooth communication and reliable delivery. Whether you need help fixing an existing app, improving UI/UX, adding features, or maintaining a production app, I’m available to help.

🏆 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 (𝐓𝐨𝐩 𝟏𝟎%) 🏆 | 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 | 𝐢𝐎𝐒 & 𝐀𝐧𝐝𝐫𝐨𝐢𝐝 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐒𝐰𝐢𝐟𝐭 | iOS App Developer Swift | 𝐊𝐨𝐭𝐥𝐢𝐧 | Android App Developer Kotlin | 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 | 𝐅𝐥𝐮𝐭𝐭𝐞𝐫 | 𝟖+ 𝐘𝐞𝐚𝐫𝐬 I’m a Mobile App Developer focused on building scalable, secure, and production-ready mobile products for iOS and Android ecosystems. My work combines mobile app development, mobile app design, clean architecture, API integrations, Firebase workflows, authentication, analytics, payments, push notifications, and long-term product support. I focus not only on features, but also on performance, stability, maintainability, and business growth. As an iOS App Developer Swift specialist, I deliver native Apple ecosystem solutions through Swift, ios development, ios mobile app development, ios swift engineering, App Store readiness, watchos, apple watch, watchkit, and smart watch integrations. My iOS experience covers MVPs, product recovery, scalable production systems, enterprise apps, and secure ios applications. As an iOS App Developer Swift expert, I focus on polished UI, reliable architecture, optimized performance, and maintainable code. As an Android App Developer Kotlin specialist, I build native Android apps using Kotlin, android app development, android development, modular architecture, Firebase, APIs, payments, analytics, authentication, and production-ready release workflows. My Android App Developer Kotlin work includes scalable android app, android app developer, android application, and complex mobile ecosystems designed for long-term growth. As an Android App Developer Kotlin expert, I focus on clean architecture, stable performance, security, and maintainable Android products. I work as an iOS App Developer Swift and Android App Developer Kotlin for businesses that need reliable native mobile development, strong technical decisions, and product-focused delivery. This native expertise helps create secure ios and android solutions for fintech, e-commerce, booking platforms, fitness, health, taxi, transportation, delivery, dating apps, social media app, live streaming app, video streaming systems, AI-based mobile systems, SaaS, business apps, wearables, and IoT. When product goals require faster launch or flexible delivery, I also support react native mobile, react native developer, react native expert, react native app, react developer, react js, react redux, react node, react native firebase, cross platform mobile development, cross platform mobile, hybrid app, hybrid app developer, flutter, flutter developer, flutter dart, flutter firebase, and flutter app workflows. ⭐️⭐️⭐️⭐️⭐️ “Reliable mobile app developer delivering stable releases. From MVP recovery to scalable production systems.” 🎯 What I bring: ✔️ 8+ years as a mobile app developer across full mobile app development lifecycles. ✔️ Strong iOS App Developer Swift background for native ios app, ios developer, senior ios developer, ios app developer, and scalable swift ios development. ✔️ Strong Android App Developer Kotlin background for native android developer work, kotlin developer workflows, android app development, and enterprise Android delivery. ✔️ Experience with API integrations, Firebase, authentication, analytics, payments, push notifications, backend coordination, wordpress, shopify, and mobile app marketing. ✔️ Product collaboration with mobile app designer, mobile app developers, product teams, and business stakeholders. 📱 Mobile Applications I Develop: • Taxi & Transportation Apps • Booking platforms • Fitness & Health Apps • AI-based mobile systems • Security-focused ios and android solutions • Fintech & Payments Apps • E-commerce apps connected with wordpress and shopify • Business & SaaS applications • Social media app, live streaming app, and video streaming platforms • Wearables & IoT systems with watchos, apple watch, watchkit, and smart watch • Delivery and Dating Apps 🚀 Technologies & Skills I architect scalable ecosystems combining native and cross-platform engineering. iOS App Developer Swift products are powered by Swift, ios developer swift workflows, ios development, ios swift delivery, App Store readiness, and iOS App Developer Swift expertise. Android App Developer Kotlin products are powered by Kotlin, android application architecture, Firebase, API connectivity, and Android App Developer Kotlin expertise. I also deliver react native, flutter, hybrid app, and cross platform mobile ecosystems. As an iOS App Developer Swift professional, I help teams build polished iOS applications that are easy to scale. With both iOS App Developer Swift and Android App Developer Kotlin expertise, I support full-cycle mobile app development. iOS App Developer Swift and Android App Developer Kotlin delivery stays production-focused. 📩 Ping me. Let’s build something great.

I build iOS apps that look exactly like the Figma design, run smoothly on real devices, and ship with clean, documented code your team can maintain for years. With 7.5 years of native iOS development, I’ve built and contributed to apps for Walmart (via Optimum), Nokia (via LTIMindtree), and other global brands like Openbank, Upstox, and Dunkin’. I don’t just write code—I take ownership of the full delivery, and leave behind a codebase that’s structured, readable, and easy to hand off. What I bring to your project: ✅ Pixel‑perfect Figma → SwiftUI/UIKit – your design, exactly, with smooth native animations. ✅ Clean architecture (MVVM, VIPER, SOLID) – I refactor messy codebases and build new apps that scale. ✅ Real‑device testing – no surprises after launch. ✅ Full documentation – architecture diagrams, setup guides, inline comments, so any developer can take over. ✅ On‑time delivery in your timezone – I’m brutally honest about deadlines and I stick to them. ✅ Long‑term partnership mindset – I’m here to earn your trust, not just a one‑off gig. 💼 What I can help your business with • End-to-end iOS app development • Native iOS apps using Swift & SwiftUI • Convert Android/Web apps into iOS apps • MVP development for startups • Long-term product maintenance & scaling • Performance optimization & refactoring • UI/UX implementation with pixel-perfect accuracy • App architecture improvement & technical consulting • Team collaboration and Agile/Scrum workflow 🛠 Technical Expertise • UI Development: UIKit, SwiftUI, Auto Layout, Core Animation • Reactive Programming: RxSwift, Combine • Networking & API Integration: RESTful APIs, URLSession, Alamofire • Backend & Cloud Services: Firebase, Firestore, Authentication, Analytics • Push Notifications: APNs, Firebase Cloud Messaging (FCM), OneSignal • Architecture Patterns: MVVM, Clean Architecture, Modular Architecture • Local Storage & Database: CoreData, UserDefaults, Realm • Media & Realtime Features: AVFoundation, WebSocket • AI & AR Features: CoreML, ARKit, Vision Framework • Authentication & Security: OAuth, JWT, Keychain • Maps & Location Services: MapKit, CoreLocation, Google Maps SDK • Testing & Debugging: XCTest, Instruments, Memory Leak Detection • CI/CD & Version Control: Git, GitHub, Fastlane, Xcode Cloud • Project Management: Agile, Scrum, Jira, Trello 📱 Notable apps I’ve worked on 📱 Walmart – Pharmacy refill flow, Tempo UI, MVVM + Coordinator 📱 Nokia – Enterprise field‑force app with offline sync 📱 Openbank – Loans & insurance modules 📱 Upstox – Stock trading and mutual fund features 📱 Dunkin’ – Order‑ahead and pickup flow 📱 Destiny Discover – Digital library app for schools If you’re looking for a senior iOS engineer who delivers pixel‑perfect, production‑ready code with zero hand‑holding, let’s talk.