I’ve played with the API a little bit... it’s a brilliant little web socket protocol. Whoever designed it was not pressured to get an MVP product out as fast as humanly possible, or has insane experience with real-time distributed protocols, or both. Discord works through arbitrary NATs and your connections persist across client updates and even device reboots. Sometimes this yields weird behavior but I find it technically reassuring more than anything. I’m pretty sure they use Erlang (Elixir) which is infamous as the language that Facebook couldn’t wrangle. I’d love to read more about their stack.