The first interview was with a Zillow representative on campus at my university. I was asked one technical question then some questions about my background. 2 days later I was invited to the onsite interview. The onsite consisted of 3 back to back 60 minute interviews with different engineers that were similar to the initial interview (whiteboard coding, general questions). I was notified the next business day that I was not selected.

I think it was three rounds during two days. They all followed the same pattern of technical questions followed by behavioural. I remember one of the interviewers was particularly nice and asked me to elaborate further one of my behavioural questions.