Cross-Platform Mobile App Build

I need a full-featured mobile application compiled for both iOS and Android from a single codebase. The core concept and screen flow are ready on my side; what I’m missing is the engineering talent to turn them into a fast, polished release that sails through App Store and Google Play review... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, App Store Optimization, Flutter, HTML5, iOS Development, iPhone, Mobile App Development, React Native)