Had first round phone interview. Interviewer was a Dev Manager in amazon.com website team. Asked a lot of computer science/algorithm/data structure questions. Expected to provide the cost of the algorithm. Given a problem over phone and asked to choose the right data structure and explain why it would be more efficient than others. This stuff can be explained by computer science grads who are out of college in the last few years. I could answer most of the questions but not as fluently since I was out of touch with this for a long time.