Something like a WebSocket server, a load balancer, message queue, that sort of thing. It's not that those aren't also complex, but there's less "business" in

Something like a WebSocket server, a load balancer, message queue, that sort of thing. It's not that those aren't also complex, but there's less "business" in the logic, if that makes sense. Something that doesn't handle arbitrary user input or deal with the messiness of humans, like first/last names, dates and timezones, etc. As an example, I had once written a WebSocket server in go which took a program as input, ran it in a heavily stripped down docker container, and streamed the stdout back to the client. Go was perfect for that use case. (though to be honest I'd pick Rust now because I'm past the learning curve on it)