Amazon Software Developer interview questions

Two phone interviews, each an hour long and followed by an assignment that I have to submit before midnight. The difficult level is similar in both interviews, I was asked about my background, some specific questions about past project. Then questions about data structure, system design, how to improve performance of a large system. Two interviewers were from different departments, and they introduced themselves as well as their current projects. In the end of each interview, they asked me to solve a BST problem, we discuss the solution first, then he asked me to write the code of that solution(even though it may not be the best solution) and email them after the phone interview.

Applied on the website and contacted for first phone interview a week later. It went well and scheduled second one week later. But they did not call me at appointed time. Sent a follow up email and scheduled second round one month later. The interviewer was very aggressive and rude.