I went through a campus recruitment event, so there were only two rounds involved: 1) a 30-min technical phone screen and 2) a 4-round onsite interview.
I was given an easy-level question during phone screen by the interviewer who was very nice and willing to communicate, so onsite was expected.
The onsite interview was well structured: 3 rounds technical interviews with some behavior questions, and 1 round pure behavior interview. I think the questions were mid-level. Most interviewers were very helpful in term of guiding me to the right direction.
I was quite impressed by this experience considering IMDb is actually part of Amazon, and I have read so many negative reviews about Amazon's interviews. The technical recruiter worked very hard to schedule interviews with a time constrain, and made sure we were all prepared for our onsites by setting up multiple call sessions. The only thing I would complain is morning session interviews were quite early, so really hard for people who have a long commute. Overall, I think IMDb is a great team within Amazon.