They are very thorough and professional by the interviewers. Each 45 minute interview is 40 minutes of questions , followed by the remaining 5 minutes where you can ask questions. The interviews were intended to cover a specific area like stakeholder collaboration, but the questions were around database performance tuning :). Unfortunately, things did not end well. An offer was already out (and accepted) while I was interviewing and being led to believe the teams would subsequently be meeting to make a final decision.

Initially heard from the lead recruiter and then spoke with the hiring manager. After that, I had the formal interview loop across six different MongoDB team members. I also had a few ad hoc discussions with the hiring manager and recruiter leading up to my final decision.