OpenTable Software Engineer interview questions

Emailed back and forth to schedule a phone interview. Got a call from a senior Data Scientist that asked me a few related algorithm question. By the end the questions were complicated enough whre it became difficult to describe over the phone. I was able to answer all questions (though I required a hint for one) and he then congratulated me on surviving the ksum question.

I was contacted by a recruiter and scheduled a phone call within a few days. The phone call was non-technical and I can't really remember what the conversation was about, but about a week after that I had a technical phone interview with their lead iOS developer. This was fairly easy and consisted of both abstract CS-theory and applied programming questions and lasted about an hour. They got back to me pretty quickly and scheduled an on-site interview about a week and a half after the phone interview. The on-site interview lasted from 2-6pm and consisted of 5 interviews of which 3 were technical and 2 were non-technical. OpenTable was kind enough to space out the technical interviews in between the non-technical interviews, and generally everyone was approachable and kind. The interview process was over all very pleasant and the technical questions weren't very difficult. All of them were done on a whiteboard as well, so there was no worry about small syntax errors and other associated stumbling blocks. Three days after the on-site interview, I heard back from them and did not receive an offer. Although they initially did not mention why, I asked them for feedback and they were quick to respond. In the end they chose to go with someone who had more exprience. 10/10 would interview again