Clojure. It’s just fun to write.
Firstly, it’s functional and “Lispy”. My code is super expressive. Writing code is like writing prose where I can choose a word (function) from a large vocabulary [1]. I can focus on high-level concepts and modifying states instead of fighting with low-level logic.
Secondly, it runs on JVM - an already robust and performant platform.
And there are so many good things that I cannot simply write in some words. The father of Clojure, Rich Hickey, is a genius in expressing Clojure’s design. You should check out some of his talks [2].
Too bad that Clojure is too “niche” that I haven’t got a chance to make a living by writing Clojure, yet. But learning it is one of the best decisions I’ve ever made in my career. Yes, it’s that good.