Not much to tell. He solved my interview problems super quickly and then we had a chat about his experience which impressed me a lot. This was many years ago (as Pebble was dying) so I don't remember the details of the conversation. He didn't accept our offer, for visa related reasons if I recall correctly, so unfortunately I didn't get to work with him. Obviously the variance on interview performance is high, and my typical interview questions are not super hard or anything, so it doesn't necessarily mean that much. But I'm confident that he was a very good engineer that I would have liked to work with.