The processed consisted of two phone interviews. The first interview was with the hiring manager. There were many ruby questions and data structure/algorithm type questions asked during this interview. One of the questions was "what would be the best data structure for implementing an auto complete mechanism?". At the end of the interview he asked me to send an implementation of Array.flatten in ruby. which I did. I got through this interview and another interview was setup. It was also a phone interview this time with a panel of folks including one co-founder. The questions were again very technical ranging from datastructures and algorithms to data structure design.