Meet Yelp guys at the University job fair. They're really nice. I got a first round phone interview two weeks later. Since I was a new CSer, I only knew some fundamentals of data structure and algorithm. For the language, I was OK with C++. But their questions were so wide, varing from basic data structure problems, to python and SQL syntax, and also some networking knowledge. So I didn't do well. But in fact the interview was quite easy and basic, as I look back now. The only difficulty is the wide coverage. So the interviewee had better prepare a wide range of knowledge for Yelp.