Build a gaming android app

We want a gaming android app similar to MPL, WinZO. Here users can play various games like Teen Patti, Rummy, Ludo, and Roulette. These games are multiplayer and also need bots. Features: Frontend 1) App should run above the android 8 version. 2) Games can be made in native android or unity. UI should be fancy with proper animation and colors. 3) Proper security checks on the android side. Most of the tasks should be done on the server side. 4) Need analytics event and can send an in-app update as well. Back-end 1) Login/SignUp with proper auth. Take care that one account must not be logged in on two devices     simultaneously. 2) Multiplayer support, Users can join the table and leave. 3) Support for rejoining: The user can join the match again if there is some network issue on the user side. Yes, we know it is      challenging, but we need to solve it with reasonable accuracy. 4) We Need to build our game server with proper sockets usage. Ex: In Ludo, we have constraints on      the number of players in a match. For now, we allow only two players in a match. The game should run on the server side,      sending value to the app within the socket. 5) Game server should be generic as much as possible so that it is easy to add more games in the future. 6) Dashboard for the owner to set game config and app setting. 7) There is no real money involved in this app, But we use virtual currency added by the owner using     the dashboard for a particular user. 8) Proper handling of hacking and security checks. 9) All APIs should use proper auth. Conditions: 1) Proper communication with the developer on the current progress with the owner. 2) The owner first verifies every design before development starts to smooth the overall process. 3) Need whole app development (frontend and development) cycle approximately timeline.