3 interviews - 1st was informal with the hiring manager, then I met with HR to discuss the position but no questions, 2nd was in person interviews with multiple people plus a seminar and one of the interviewers gave me an unexpected pop quiz (kind of technical interview), 3rd was with hiring manager again and informal

Short interviews with multiple people who may be future co-workers and supervisors, asked about resume and time I faced a challenge. Gave a presentation on earlier research with a couple of reasonable questions at the end.