Was 2 interviews, one with the CTO, and a 2 hour 1 on 1 interview with the CEO. There were some basic questions to make sure I knew what I was talking about, although I got a good referral from my friend who works there, so they trusted her opinion about my work abilities. Mostly personality questions and making sure we were on the same page for what I was looking for Technology / career wise, and that I would be a good culture fit, which is basically a bunch of weirdos who like to laugh at non-sensical things.