Three rounds: phone interview, in-person, and then final test. This was one of the more enjoyable interviews I've had in a long time. The founders are very approachable and upfront and everyone truly believes in the mission. The energy of the place was great. The interviews were very thorough and gave me the opportunity to ask a lot of questions about the entire business. I regretfully majorly messed up on the final test, so unsurprisingly they didn't offer me a position, but still a very positive experience nonetheless.