I applied online. The process took 3+ months.

I went through an experience similar to a report posted here. It was a very long selection process that gives the impression of leaving the candidate a bit aside throughout the process. The pair-programming stage was not very clear as to how it would happen, considering that each company does pairing in a different way during hiring. It was not clear if they would pass an exercise to be solved on the spot, if it would be pair programming with the team members, and if it would be necessary to bring your laptop, considering that if it is to develop a complete feature in the case of Clojure, the candidate's usual development environment is paramount. Anyway, the company seems to be cool, and the selection process before the final stage is interesting, but the final pair programming stage seemed confusing to me and the final feedback was quite generic. I am sure they have already missed the opportunity to have excellent devs on the team because of simple errors to fix in this stage.

What do you know about functional programming?