Yelp Backend Developer interview questions

First round is OA, which could easily passed if you prepared well. Second round is Skype interview, first part is basic Web development knowledge like restful, Index in SQL, difference between stateless and stateful, the coding part is question similar Graph topological sorting. Onsite was four round almost without break. It's very similar to the skype interview, except they also want you to design the prototype of some function including design the relational database. Coding is not hard, if you had done some practice in Heap, Graph and backtracking. However, I did bad in one question, LCA of N-ary tree. I tried to use dfs to solve it but didn't handle the return very well, the correct answer interviewer provided me is like using bfs.

There are first very easy online assessment, easier than leetcode easy problems. If you passed the OA, then phone interview. Since I didn't pass the first round phone interview, I don't know what's next.