I'm a backend developer and one project I've written a simple HTTP server a few times in different languages. I like it because it's not too complicated but at

I'm a backend developer and one project I've written a simple HTTP server a few times in different languages. I like it because it's not too complicated but at the minimum you're exposed to the string processing and synchronous IO features of the language, and if you want you can do things like write an async server or multi-threaded server.