Android App with Authentication

I need a seasoned developer who can take my idea from concept to a polished Android application. The core of the build is a solid user-authentication flow (signup, login, password recovery) tied to a referral system that lets existing users invite new ones and rewards them automatically... (Budget: ₹10000 - ₹15000 INR, Jobs: Android, Android App Development, App Design, Backend Development, Java, Mobile App Development, PHP, React Native, React.js, UI / User Interface)