Tripadvisor Software Developer interview questions

The interview process consisted of three skype interviews. In each interview I had to write Java code. The interviews lasted for between 25 - 45 minutes. They want you to talk through your thought process. I found this part hard and is probably the reason I did not get the position. As far as I know I got all the answers correct.

I was recruited after on campus interviews which were a series of problems that I coded on paper. I was told to do some engineering challenges on their website, so I did, and I contacted them afterward. Got flown out to Boston two weeks later for an onsite. Four stage interview, with questions that seemed to vary greatly from interviewer to interviewer. Code on whiteboard questions only, no system architecture. Heard back in a week.