It was a condensed, but interesting process. The interviewers were all very helpful and were guiding the conversation. The entire thing took about 2.5 weeks and everyone was very communicative and flexible in terms of scheduling throughout. I came away feeling impressed with the company and disappointed they didn't see a fit for me in a different role (I lacked the experience to succeed in the role I interviewed for). When applying, I was asked to fill out a questionnaire on their website. Overall, the way it is embedded seems a little counterproductive to the amount of detail I assume they want to see in your answers. After that I had a 20-30 minute screening phone call with the CTO (who was the hiring manager in my case), and he gave me an overview of the hiring process in that call, which was very helpful.
The next step was a Product Sense interview with the CEO (which was scheduled to be 45 minutes but ran extremely long) and then an hour long Product Execution + Leadership interview with one of the co-founders (who is an ex-Facebook PM) in which the CTO also sat in, but didn't participate beyond answering my own questions at the end of the interview.
I believe the last step is meant to be an interview with a fellow PM from the team but I haven't reached that far. But I did have a very pleasant and candid conversation with the CTO after he had let me know they wouldn't be continuing the process with me, and their transparency was very useful.