I have written a bunch of Clojure in previous positions. But it has undergone the same fate that almost all functional code bases I have knowledge of (in corporate product settings): Colleagues have hard times getting into the functional mindset, and it becomes hard to maintain. Over the years it gets replaced with some more pragmatic hybrid- og OO language.
I have seen the same with projects written in Haskell, Erlang, and Elixir.
It's all a really nice idea, but in practical reality it runs into issues with "social scaling"
EDIT: Realizing this was not super helpful. If you want to look for positions where fp can be employed I think something academia related, or a startup where there is greater technical flexibility is something to look for
Not sure. But I think starting out early in the growth fase of the company and having a strong core of senior enginnees that can push for it and ensures everyone learns good practices