Flew to Boston to interview for 3 days. The flight and accommodations were paid for. I was coming from California. They were extremely accommodating and amazing. They also paid for meals. I had to talk to 10+ people and interview with each of them.

I was contacted by my future supervisor and had a phone screen first, there were just some questions to go through my resume. Then I had an on-site interview, they introduced their work and showed me some results, then there were some more technical questions, personality questions, and discussion about the position.