Super relaxed. Had a phone call with a full time developer where we talked about my interests, what I was looking for in a software development internship, and the work that the full time developers got to do in the day to day. No technical questions, about an hour long.

across 4 interviews, everyone i spoke to was extremely easy to get along with. they asked me about my personal life as well as some mild technical questions to get a sense of my current skill level -- no gotcha questions. it was also immediately evident that they all genuinely enjoyed working there