As a language geek myself, I've been working a lot with Elixir lately at $WORK, which has been an absolute dream. There's pioneer taxes and bug fixes we have to push upstream occasionally to some of our dependencies, but it's been extremely pleasant so far. Clean syntax, well thought out internals, 30 year old host platform designed for server programming, Lisp style macros (it really feels like a Lisp) , an "explicit over implicit" mentality, immutable everything, and a wonderful "Rails without magic" web framework to go along with it.