A total of 3 technical interviews - 2 with engineers from the Perception team and one with the CEO. This was followed by an hour-long discussion with the other co-founder who focuses on product. One of the smoothest and quickest loops I've had - the HR coordinating the interviews was super responsive and the interviewers were really smart & fun to talk to. Got an offer within a week of my first interview so you get a taste of how fast the company moves.