Build Cross-Platform Mobile App

I’m looking to have a fully-functional mobile app created and ready for both iOS and Android devices. The core build, polished UI, and store-ready packages all need to be wrapped up within the next month, so a streamlined, well-tested approach is essential... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, Flutter, iOS Development, iPhone, Mobile App Development, Objective C, React Native)