[iLemming]

I do work for a Fintech startup as well. We use Clojure and Clojurescript - it simply makes sense for us. It is extremely pragmatic choice that allows us to move fast safely. Seeing and experiencing all three sides - in all honestly I have to admit: yes, Java and Javascript are inherently less efficient languages for writing software than Clojure/Clojurescript. Java and Javascript are good, sorta "low-level" languages if you required to stay close to the platform they are made for, but in most cases (I'm just gonna throw some arbitrary number like 90%) it is not what's needed. They kind of have become "assembly" of JVM and Web.

[DrMagnus]

I don't work for a Fintech startup, I work in finance.

There's a huge difference between startup culture and corporate culture.