Applied online via the standard process, got contacted by a recruiter asking for a short phone interview. I was scheduled for a short online coding test which was pretty easy (all answers can be found on glassdoor, yelp should get rid of this part imho. a lot of the generic multiple choice questions were irrelevant to my skills, interests, and experience). After that, I had another interview with an engineer over skype, then after passing that I had 2 more interviews with other engineers (one of them was actually a video interview with a coding question on video). None of the interview questions were difficult or tricky in my opinion. It really helps if you know Python.

Leetcode style interview online via link, then a 1 on 1 technical interview with a lead developer also online where you can ask questions about the role and working at yelp, later more in depth technical tests and finally references and psicological tests.