I build, improve and rescue Flutter applications for Android, iOS and web. I can diagnose difficult UI, state-management, networking, deep-linking, notification, background-processing and release issues; integrate REST APIs and PostgreSQL-backed services; and optimize performance on real devices. I lead development of the production Festapp platform and work comfortably in existing codebases. I begin with a reproducible diagnosis, then deliver focused, tested Dart changes, clear release notes and practical before/after evidence.