The game is a client-server game, where the server side is actually running all the game mechanics and the client side provides the player to interact with the game, this choice aims at preventing cheating from players.
The server (backend) is written in C++, specifically C++17, and it's basically a Linux executable (could be ported to Windows or Mac easily i guess).
The client (frontend) is a Godot application that aims a providing easily multi-platform support. At this time i have tested it on Linux and Android.
Client and server talks to each other by binary optimized JSON messages, this allows for easier development of new clients and fast, efficient data exchange at the same time.