Comment by Tainnor

> probably even Swift

It's possible to write web backends in Swift, but it's probably not a good idea. When I last did so, I ran into ridiculous issues all the time, such as lazy variables not being thread-safe, secondary threads having ridiculously small (and non-adjustable) stack sizes and there being generally absolutely no story for failure recovery (have fun losing all your other in-flight requests and restarting your app in case of an invalid array access). It's possible that some of this has been fixed in the last 5 years since I stopped working on that project, but given Apple's priorities, I somehow doubt that the situation is significantly better.