Gmail Email Mobile App

I need a lightweight mobile application whose single, clear purpose is to let users send and receive emails from their Gmail account. OAuth-based sign-in, inbox view, compose/reply/forward, and real-time push notifications for new messages are the core features I’m after... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Backend Development, Flutter, iPhone, Mobile App Development, OAuth, PhoneGap, React Native)