I was one of 25 people who qualified for the Onsite round of Google Code Jam in New York. I decided to interview with them on the day before the actual competition. There was no phone interview, since getting into the Onsite round of GCJ is considerably harder than passing a phone interview. There were 4 interviews in total, each being 45 minutes long. There was a lunch break after the first two. The third interviewer was about 25 minutes late, so they decided to put him after the fourth one. All that extra time, I could explore the floor. They even agreed to arrange me a short show-around. The interview questions seemed rather easy to me; some of them seemed to have roots in classical programming olympiad problems. They told me in a week that I did well on the interview. Then they sent all my feedback to a recruiter in London because I wanted to work in Zurich and not in America. There were several more things they wanted to know before they could make the final decision: grades in university, current salary, and so on. Thus, in about one month after the interview, they came up with the offer. It's also worth noting that I am still on my last year in university, so I will only start working in about a year.

Nothing seemed really difficult to me, and I could usually find a good approach nearly immediately. Whiteboard coding took considerably more time than thinking.