Applied through the website of Amazon careers. 2 weeks after got an email for a phone screening. Within 30s I was coding a problem. Given an array of integers and a number return all the pairs of integer which sum to that number. Then I also got a couple of behavioral questions. In total it was one hour. The on-site interview was in Cambridge, 5 interviews of one hour each one. Lot of behavioral questions. One design exercise (a parking) 2 coding questions and a conversation about knowledge acquisition problem.