Met the company at a career fair at my university and spoke with multiple people. I was invited to an on-campus interview which was a 1:1 with a partner. We basically just had a conversation. He asked about my interests outside of school and got talking about those subjects for 45 minutes (it was only supposed to be 30 mins). 3 weeks later, I got an invitation to an office visit interview. The night before there was a cocktail social at a nice hotel where I got to meet a lot of employees and other students interviewing as well. The office visit consisted of 3 30 minute interviews, 2 of them with partners, 1 with a manager. They didn't ask me any of the typical interview behavioral questions, instead we just had a casual conversation. It was great because I had meet 2 of them previously at the socials/career fair so it was a comfortable and relaxed conversation. After the interviews, they took all of the interviewees to lunch where we got to chat some more.