I had a very similar experience to one of the other reviewers: They seemed a bit arrogant, and the process was arduous. After a few hours on the phone with the recruiter, it was explained to me that there would then be a take-home test, a 1-hour phone coding challenge, and a 4-hour coding challenge on-site. They seemed very proud of this interview process. I heard the practice defended as a high bar with which to weed out underperforming developers. To me, it sounded a bit more about maintaining an air of superiority; they are a "Bay Area startup", after all.

The recruiter did strike me as a well-grounded and likable guy. He tried his best to tell things to me straight and sell the company as being a great bet for the future. I ended my interview process by choice before attempting the take-home test because things picked up at my current job. I just couldn't justify giving some ascended San Francisco developers a full day of my time so they could judge whether I was up to their "Bay Area" standards.

The first at-home programming wasn't really a quick challenge, more of a mini-project.