The interview process was what you'd expect from a company like this. I had about three phone screens. All of them were technical, and the last one included a code snippet, followed by an all-day on-site interview.

The on-site consisted of one-hour interviews every hour, from 11 AM to 5 PM. All the interviews were very technical.

I was asked to solve various problems, covering typical algorithm and data structure subjects, as well as explain the various projects I worked on in my most recent position.

The questions involved a lot of thinking, but I was able to find my way to the solutions after some time.

All in all, I'd say it was too bad, as I had prepared by practicing algorithms (searching, sorting, etc.) and brushing up on Objective-C. I had to teach myself the latter in the two weeks leading up to the on-site.

A good TopCoder browse is a good resource for preparing to interview with this company.

How would you speed up your typical bit reversal algorithm?