Roman A.

React Native Developer | Mobile App Development | iOS, Android, AI

React Native Developer and Mobile App Developer with 10+ years building iOS and Android apps. Top Rated Plus on Upwork: 100% Job Success Score, 25+ projects, 4,400+ hours, $100K+ earned. 🎁 Send me your idea, Figma prototype, or existing codebase — I'll review the architecture, scope and risks and tell you what to build first. Free, no obligation. 📱 WHAT I BUILD I handle the full mobile app development lifecycle, so you don't need to coordinate separate people for frontend, backend, integrations, testing and store submission: ✅ Cross-platform React Native mobile applications for iOS and Android ✅ Startup MVPs and production-ready mobile apps ✅ AI-powered mobile applications — OpenAI, Claude, RAG pipelines, in-app assistants ✅ Rescuing and refactoring existing React Native codebases ✅ Web dashboards and admin panels for your mobile app (React.js, Next.js) ✅ App Store and Google Play submission, releases and ongoing maintenance Features I deliver regularly: authentication and social login, REST and GraphQL API integration, payments, subscriptions and in-app purchases, push notifications, real-time chat, maps and geolocation, camera and media, offline mode, analytics and crash reporting. 🏢 INDUSTRIES Fintech · Healthcare · Fitness and wellness · E-commerce and marketplaces · Social networking · SaaS platforms · Real estate · Food delivery and logistics · EdTech 🛠️ TECH STACK Mobile: React Native, Expo, TypeScript, JavaScript, iOS Development, Android App Development, Kotlin / Java (Android Studio), Swift / Objective-C (Xcode) Web: React.js, Next.js, TypeScript Backend: Node.js, NestJS, REST APIs, WebSockets Data: Firebase, Firestore, MongoDB, SQL, PostgreSQL AI-assisted delivery: Claude Code, Cursor, OpenAI and Anthropic APIs — I use these to ship faster without giving up code quality or architecture ⚙️ HOW I WORK ✅ 100% Job Success Score across 26 contracts, all 5-star ✅ 0-4 hour response time — you won't be left waiting ✅ Clear architecture decisions explained in plain language, not jargon ✅ Weekly demos so you always know what shipped and what's next ✅ Honest feedback and realistic timelines — I'll tell you when something is a bad idea ✅ Clean, documented, maintainable code you can hand to any other developer 🤝 BEYOND CODELINE For larger projects I can bring in my agency, Beyond Codeline: a hand-picked team of senior developers, designers and project managers working in Agile sprints across any time zone. You get the same accountability, more throughput. 📩 Have a mobile app you want built, fixed or shipped? Send me a message with what you're working on and I'll come back with an honest assessment of scope, timeline and cost.