I can't go into detail as I had to sign an NDA. It was a pretty messy process overall.

My first interview involved me sitting in a call for an hour. The recruiters who organized the interview were uncontactable, and only after the interview finished did I get a response that they were sorry and it needed to be rearranged. It was a bit of a red flag, but these things happen.

The interviews feel as though they expect you to regurgitate the perfect solution as they ask questions about the details. Personally, I don't believe these interviews would give Confluent a good understanding of a candidate's problem-solving ability, their collaborative ability, or their thought process. However, it will tell them if you can search the internet for their interview process, as I've just found out from Glassdoor that their process is still leaked (despite the NDA?).