Amazon Software Developer interview questions

I taken a campus interview, and failed in second round. First round, I faced one tech interviewer, which threw me an problem about trie. I didn't figure that out. Second round, 3 back-to-back interviews with three tech interviewers, 45 mins each.

Was recruited by one of their recruiters. Talked to them and was initially very exited for the position until I made it to this site and saw other reviews on the questions asked and process. I discovered that this probably wasn't the position I was looking for, but I went ahead with the first interview anyway. Their interview process seems very 'old school' to me and not very conducive to hiring great employees. The questions were all about algorithms and data structures, and nothing really about past work, or real world experience. This was stuff I learned during my college career (the stuff I ignored thinking I'd never use it in the real world). I'll give them the benefit of the doubt though, this was a software engineering position, which really isn't my interest or expertise.