Android Task Earner App Build

I need a full-stack Android solution for my project, “A.S Task Earner.” The user-facing app should allow regular users to register with their phone number, email, username and password, then sign in through Firebase Authentication... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, Android App Development, AngularJS, API Development, App Design, Full Stack Development, Mobile App Development, PHP, UI / User Interface, Web Development)