I was asked to solve a problem in Java and submit the code. They were impressed enough to schedule two phone interviews, and again, I performed well enough that I was invited for an on-site interview in Seattle. I lived out of town, about 3 hours away, so I had to drive in for the interview.

I had 5 interviews, which seemed to progress in order of seniority. Everything went pretty well, I thought, but I never heard back from anyone. I even sent a follow-up email a week later, politely asking if they needed any more information, but never heard a thing.

In my opinion, it's extremely unprofessional to ignore a candidate after they've written a code sample, completed two phone interviews, and participated in 5 hours of on-site interviews. I was not impressed with the recruiting process.

None, mostly questions right out of popular coding interview books.