I've had a pretty poor experience working with the CTO. I almost didn't take the job because of how the interview went with him; he was super distracted the entire time, not really focused on me, and just super cold in general. I shrugged and just passed it off as him putting on his interview face, but then I got hired and realized that's just how he is all the time (if you interview with him you'll see exactly what I'm talking about). He has little control over his emotions. He'll randomly be in a terrible mood one day for absolutely no reason, and will be slamming his fist against his desk, making super passive-aggressive comments to the people around him, or even straight up spiking his computer (yes, this actually happened one time. Very alarming). I legitimately do not feel safe around him at times. Don't get me wrong; the guy is one of the smartest people I know and really knows is stuff, but is also extremely cocky and overly self-confident, which has led to many poor decisions. And I promise you I am not the only engineer that feels this way; many people I've talked to (even non-engineers) feel similarly.