What can be the back end of an Android app like Clash of clans, Boom Beach, etc.?

Question

Game development

I need guidelines for the backend in the development of the game for android. And, since I still do not have serious experience, I would like to ask a question that interests me very much from more experienced colleagues.
In general, I rush between many options for building the server side of the application. The game itself is being developed on unity, and since I plan to eventually release a game similar to Clash of clans, Boom beach and the like, the issue of the backend for my project is obviously extremely important. As far as I have already understood, such solutions require an authoritarian server, perhaps even completely written from scratch. So the question is which way to go.

Answer 1

It doesn't matter what the game is written in. the easiest option is to use http server and rest api written in php/python/ruby/js(nodejs), or write your own game server application in c++/c#/delphi/java, develop your own protocol for data exchange, etc.