I was referred. I had a short phone interview, then completed a programming assignment on my own time, which I sent back to them.

I went in for the full interview - two technical interviews, and two nontechnical interviews. The questions weren't that difficult, but I was surprised at the degree to which they just asked me to do the problem on my own computer - I was expecting a whiteboard session.

Without giving away specifics, I was asked to solve a problem involving a data structure that wasn't conceptually difficult, just very problem-specific and which I had trouble debugging.

Given another thirty minutes, my code would have run fine - but they seem very fixed on functional code within time limits.