One of the best interview experiences I've had the opportunity to be a part of! I went through the following rounds: Recruiter screen, hiring manager interview, take-home technical exercise, panel interview (4 rounds of 30-45 mins each), founding member rounds (one with the CTO, and another with the CEO) also 30-45 mins each. The recruiter was a joy to work with, he made sure that I was prepared by giving a high-level overview of what to expect at each round of the interview process. Everyone I spoke with seemed like very smart, and kind people and I know I would've had a great experience working there had I accepted the offer.

First round screen with the recruiter who was friendly but suspiciously always emailed well outside business hours, semi-technical second round with the hiring manager where recruiter explicitly said it went "really great" and they wanted to move forward, third round was a brief assignment reading API documentation and responding to a mock customer email within 24 hours that seemed impossible to fail, yet was still turned down three days later. So, that was a misleading waste of time. Did not reach mentioned fourth round panel interview or fifth round CEO interview.