Cross-Platform Social Networking App

I need a full social-networking application that runs smoothly on both iOS and Android from a single codebase. The core experience must include real-time messaging, rich user profiles, and built-in video and audio calling... (Budget: ₹150000 - ₹250000 INR, Jobs: Android, API Development, Backend Development, Flutter, iPhone, Mobile App Development, Objective C, React Native)