Cross-Platform Mobile App Build

I need an intermediate-level mobile application created from scratch for both iOS and Android. The core objective is to hand me a fully functional, well-structured codebase along with the compiled builds ready to submit to the App Store and Google Play... (Budget: ₹100 - ₹400 INR, Jobs: Android, Flutter, iOS Development, iPhone, Kotlin, Mobile App Development, PhoneGap, React Native)