The number of rounds depends on the department, but first you'll meet with HR, then with a supervisor, then perhaps the PI or doctor in charge or with a peer panel. It takes a while to go through the entire process which is a little frustrating, but everyone has generally been nice.

Interviewer was friendly and gave me feedback during the interview which I liked. But by the final interview I had a strong feeling I didn't get and wish they just cut me loose earlier.