Yelp Machine Learning Engineer interview questions

There are five rounds of interviews. The first is a 30-minute HR screening, followed by a 1-hour live coding interview at a LeetCode medium level. The third round is a 15-minute cultural interview (optional). The fourth round is a 2-hour session that includes live coding, planning, and HR discussions.

1 online coding screening and 2 rounds. First round a coding interview with a member of the Engineering team, and second round an onsite interview, with 4 interviews of system design, coding, behavioural, and "past projects". Overall the interviews were good, but after the last one, I didn't hear anything back for 2 weeks and then a rejection. When I asked for clarification, they emailed backed 3 weeks later saying "you didn't ask enough questions on the system design interview" which is their usual response, and not true in my case.