It was a test over google docs over the interview. Timed. For review later. There were several puzzles, from easy to weird and difficult. Note I wasn't given any feedback during the interview.

I can't remember exact process, but in summary there were 5 meetings: - Motivation. - Algorithms: graphs, recursion, arrays, trees, dynamic programming. - System design: distributed system with concurrent reads/writes. - Object/class design requiring data structure trade-off reasoning. - Low-level performance and architecture discussion.