Transit App Finalization & Maintenance

I’m wrapping up a dual-purpose local transit and delivery application that serves riders and couriers on both iOS and Android. The core features are coded and running, but I need a seasoned developer to carry the product across the finish line and keep it healthy afterward... (Budget: $250 - $750 USD, Jobs: Android, API Integration, Backend Development, Flutter, Frontend Development, iOS Development, iPhone, Mobile App Development, User Interface / IA)