Ossacodes

Mobile app design and development

Fiverr • Freiberufler

Mar 2021 - Present • 5 yrs 7 mos

I am a senior Flutter and full-stack developer with more than four years of experience building mobile, web, desktop, and AI-powered applications. I specialize in Flutter development for iOS, Android, web, and macOS, with strong experience in Firebase, Supabase, Node.js, Python, REST APIs, real-time communication, payments, subscriptions, and AI integrations. I have built and launched production-ready applications, including real-time chat platforms, video-calling apps, AI note-taking tools, photo-management apps, media editors, social platforms, and subscription-based products. My technical experience includes Firebase Authentication, Firestore, Cloud Functions, Storage, FCM, App Check, PostgreSQL, MongoDB, Appwrite, Algolia, Stripe, RevenueCat, Apple Pay, Google Play Billing, WebRTC, Agora, LiveKit, FFmpeg, maps, push notifications, offline caching, and background processing. Key achievements include: • Building scalable chat applications with media sharing, contact synchronization, push notifications, secure authentication, and offline support • Integrating AI features for text generation, image generation, content analysis, and workflow automation • Developing voice and video-calling features • Launching multiple iOS applications • Creating cross-platform products from a shared Flutter codebase • Solving complex performance, deployment, Firebase, App Store, and Google Play issues I can build an application from scratch, improve an existing codebase, fix difficult bugs, integrate APIs, add AI features, set up payments or subscriptions, and prepare applications for release. I focus on clean architecture, reliable communication, scalable solutions, and delivering products that are ready for real users.