Sahibul N.

I build and take over Flutter apps for iOS, Android and web, with Supabase, Firebase or Golang backends. Recent client work: a 102K-line workflow studio for the agency BonkBytes, and Cardx, a sports card collection app on Flutter and Golang. New builds, takeovers and refactors are my usual work, including native home-screen widgets and Flutter Web editors. I use Cursor, Claude and Codex to move faster, and I write automated tests for what I ship. Work you can check: - BonkBytes workflow studio (software agency client): Flutter Web visual DAG editor, Deno sandbox for JS steps, YAML blueprints, Supabase Realtime presence, 545 tests, 38 Postgres migrations with RLS, hosted on AWS S3 and CloudFront. - Cardx: sports card collection and portfolio tracking app. Flutter iOS and web, Golang REST services, PostgreSQL and Supabase, eBay marketplace search, crawlers that track sales history, and Redis for caching and eBay token refresh. - Practice by Musopen (10K+ downloads on Google Play, also on the App Store): iOS WidgetKit and Android Glance home widgets, Dynamic Island and Live Activities with timer drift correction, and a practice engine with metronome and waveform recording. - DrugLift: Flutter courier driver app with a Hive offline queue for signatures, photos and failed-delivery retries, plus English and Indonesian localization (260+ strings). - hiQuran: Flutter Quran app with GetX, Supabase and Firebase, 65+ GitHub stars. Based in Aceh, Indonesia (UTC+7), available 30+ hours a week. Send me your app, your repo or a short brief here on Upwork. I usually reply within 24 hours.