Amazon Sr Developer interview questions

The initial phone screens were more to get to know my experience and skill set. They did ask some basic Java, DB, problem solving skills. After 2 rounds of phone screen, they asked me to visit their office in the city. The 1st person tested data stuctures, dynamic programming, complexity analysis etc. The 2nd interviewer asked me to explain how internet works and how http works and how to improve the performance of a web site. 3rd one also carried coding and technical design exercises. The next day recruiter called me and informed that they are not moving forward