Applied online and got a initial phone screen with HR. Then it was an hour long technical screen about binary search. After that they brought me on-site and we went through 5 rounds of interviews. Four rounds were technical and one lunch interview. The interviews covered a lot of area of computer science, including tree traversal, object-oriented programming, linked list, cache, optimizing, and closest neighbour problem. I didn't do well on two of the four technical rounds, and got a call two days after that I did not pass the tech interviews. The problems are difficult but not undoable, so I am not really surprised with the rejection but a bit disappointed. It seemed like a very cool company and the engineers were friendly.