There were two interviews, the first was a quick preliminary to ask about experience/why you want to work here/general questions (around 15 minutes) and the other was longer (around 45-60 minutes) and got into more technical questions. The first had three people observing with one asking questions, and the second had five all taking turns. Everybody was easygoing throughout and eventually the interview felt less like an interview and more like a conversation. Started discussing an offer a few days later.