Multiplayer mobile game iOS/Android

Hello, I would like to create a game for mobile (but compatible with facebookgame as well)
The framework to be used is Phaser3 with nodejs, socket.io and express.
The server must be authoritative and work with game interpolation&reconciliation.
The game is essentially very similar to http://slither.io/

If you read everything please write the name of the capital of France.

Thanks for you interest.