I submitted an application, did a simple first round data assignment, then a Zoom interview, another (much more complex, week-long) data and writing assignment, and then had a super day style series of interviews with four members of the team, ending with the founder. Each of the final interviews has a different tilt, including pitching your assignment deliverable in one, a live case study in another, various behavioral and culture questions, and lots of opportunities to ask about the company and role. The interviews themselves were relatively casual, but the second data assignment is open-ended and very time intensive. The entire hiring process was a big time commitment, but all the steps were laid out before the first round and they were accommodative in letting me schedule the various stages around the dates that worked best for me.