HR ask for some basic questions regarding major, year of college, and preferred location, then an online video interview, and finally a super day with 3 interviews back to back

First round was a phone interview. Some behaviour questions and simple technical questions were asked. Second round on-site superday interview. Three back-to-back interviews, almost all behaviour questions. They are nice and friendly. Third round still phone interview with department head, very detailed questions regarding resume, somewhat stressful.