I applied through university. The process took 5 weeks. I interviewed at Yelp
Interview
It starts with a short phone screening and a role play. This is followed by a few other interviews, ( mine were Skype) . There are more role plays each round, but the rest of the questions are pretty basic and are just about your background and interest in Yelp.
Interview questions [1]
Question 1
Role plays, but they coach you through them and really are just seeing if you are competent enough to hold the conversation.