Rapid Cross-Platform App MVP

I need a simple yet fully-functional mobile app built fast—an MVP I can run on Android first, but written in a cross-platform framework (Flutter, React Native or similar) so iOS can be added later with minimal effort... (Budget: ₹600 - ₹1500 INR, Jobs: Android, AngularJS, Backend Development, Flutter, Mobile App Development, PHP, React Native, Software Development)