Need esports app back-end completion for my app

Hi, I have a complete design ready android app. I need you to develop it's back-end with Firebase firestore. This is a gaming tournament app with refer n earn feature. This app has phone authentication system active.

You need the develop the rest things with firestore and assign 3 type of roles, Admin, manager, user. Managers should update the match info and distribute prize money inside the app without going to code or database.