Amazon Software Development Engineer interview questions

Weeks after applying online, I received the link for Amazon's online assessment. The assessment consisted of 7 debugging questions to be completed in 20 minutes. I successfully debugged each code fragment and was contacted for a final technical phone interview a few days later. There were two questions, both of which were relatively easy (nothing more difficult than tree traversal). I was able to answer the first question pretty quickly but took some time to optimize it, and then struggled with the second question only getting the chance to agree on a solution with the interviewer but not code it up. I received a rejection email a few days later. It was a good experience and my interviewer was great, working collaboratively with me to find a solution.