Dev here. Client side is javascript, no frameworks or anything. Server side is C++ with libuv for abstracting networking (I test it on windows but the actual servers are linux).

I found your inclusion of Bootstrap to be mildly amusing :)

Ops. I reused some code from another game, I forgot I had bootstrap only for that one button, lol.

I would like to know as well.

This looks like Socket.IO app.