What language and environment to choose for the client-server?

Question

Python

It is necessary to develop a service that should work on android, ios and in the browser, that is, the web face.
The question is this:

What language and what frameworks / technologies to choose for writing this creation?

I myself am familiar at the initial level only with python and c ++. It would be desirable for all (both clients, and the server) to use one language/platform/technology. I read that C# allows you to write a server together with ASP, and clients for android / ios with Xamarin. Is it so? And are there other options?

Answer 1

Develop on what you personally (or the developers you hire) know best .
If this is a web client and a simple site is enough, then you don’t need to go into any jungle with Xamarin.
Python and C# are quite advanced tools for building websites.

Answer 2

If you know a little python, then you can write the back-end in django, and then draw the front for phones using the restful api on react nativ. And if you want to write absolutely everything on one, then do the server on node.js, and the front on the same react native