Cross-Platform Productivity App Development

I am building a productivity-focused mobile application that must run natively on both iOS and Android. The core concept and screen-flow are already sketched; what I need now is a skilled coder who can turn those ideas into a reliable, polished product... (Budget: ₹150000 - ₹250000 INR, Jobs: Android, Flutter, iOS Development, iPhone, Kotlin, Mobile App Development, Objective C, React Native)