We had 4 interviews (screening with a recruiter, meeting & technical interview with the team, take-home assignment discussion, behavioral interview). Overall, it was a good experience but there was a minor lack of transparency and the whole process took almost 3 months (+ initial screening call was ~1.5 month after I applied for a position via JetBrains' own career website).

Interviews themselves were held in a very professional and friendly atmosphere. I really liked the take-home assignment and the fact that I was provided an LLM API-key that I used for both implementing the assignment and testing it (LLM-as-a-judge).