I did some weird stuff with a custom Hue CLI Module for my lab. It’s a fun little, fairly kludgey example of something you could spin up super easily.
In Haskell (much of the time), they say if it compiles it ships! It’s a lazily-evaluated language which lends itself well to a config and it slots right into NixOS quite well since Nix is also a lazily evaluated purely functional language.