Viktor I.

Mobile App Developer / Mobile App Development / AI/iOS/Android

🚀 AI Mobile App Developer | Senior Android & iOS Engineer, 9+ years. I build production apps and add AI features that people actually use. ABOUT ME • 9+ years, 40+ apps shipped. Flutter, React Native, native Android and native iOS. • Top Rated on Upwork. 26 jobs, 100% Job Success, 5-star feedback. • 500K+ downloads across 15+ published apps. • 99.9% crash-free sessions. Cut production crashes by 40% with Firebase and Sentry monitoring. • I work EU hours with US overlap. I reply within 0-4 hours and can usually start within 24. AI FEATURES This is most of my work now. 5+ AI-powered features shipped to production (voice, vision, LLM), cutting manual workflows by around 40%. I build on top of OpenAI, Anthropic and Google Gemini APIs. • Chatbots and in-app assistants with streaming responses, conversation memory and RAG over your own documents • Image generation and editing, with the paywall, subscriptions and in-app purchases wired in • Speech recognition and voice-to-text, 95%+ accuracy, 3+ apps • Computer vision: camera capture and on-device inference with ML Kit, Core ML and TensorFlow Lite, for when the data can't leave the phone • AI agents and workflow automation inside mobile apps • I also run an MCP-based AI pipeline in my own development process. It is a big part of why I ship fast. PLATFORMS • Flutter and React Native: 8+ launches. Usually 4-6 weeks faster to market than running two native teams. • 12+ dual-platform products maintained from one codebase, roughly 35% lower maintenance cost. • Native Android in Kotlin: 20+ builds. Jetpack Compose, Coroutines, Hilt, MVVM, MVI, Clean Architecture. 30% faster release cycles. • Native iOS in Swift and SwiftUI: 10+ apps, 25% smoother onboarding. • Kotlin Multiplatform: 6+ apps sharing one codebase, about 20% cheaper than two native builds. • 15+ App Store and Google Play submissions handled start to finish. If you haven't picked a stack yet, tell me what the app has to do and who maintains it after launch, and I'll say which one I would use. INDUSTRIES • GPS and navigation: 15+ map apps, 6+ with live fleet and delivery tracking, 99.5% location accuracy • Retail and hospitality: 3+ self-service kiosk apps, each handling 1,000+ transactions a day • Warehouse and inventory: 4+ barcode scanning apps with real-time stock sync • Media and camera: 8+ capture tools, including 360° camera integration • Games: 3+ Unity-integrated apps with real-time rendering and physics • Full stack and SaaS: 10+ end-to-end builds with backend, web admin dashboard and mobile client TOOLS • Flutter, React Native, Kotlin, Swift, SwiftUI, Jetpack Compose, Java • API integration, Firebase (Auth, Firestore, Cloud Functions), push notifications, real-time chat, payments (Stripe, RevenueCat) • Firebase Crashlytics, Sentry, Android Profiler, custom analytics • 20+ CI/CD pipelines set up. Git, Jenkins, Jira, automated test coverage. 35% faster build and release cycles. • Google Maps SDK, Mapbox, speech recognition, camera and Bluetooth hardware 📩 If you want to add AI to an existing app or build something new, send me a rough description and I'll tell you how I would approach it.