(EA at Amazon Studios in Santa Monica) Everything you've read about the interview process is true: it's tough, lengthy and there are several steps to go through so you have to be patient. I was contacted by a recruiter via Linkedin then had a phone interview with her about a week later. She told me the entire process takes about 5-6 weeks, but they will speed it up if you have another pending offer.
Then I received an EA questionnaire containing 1 question to which I had to write a 1 page response to.
Also had to take a skills test, which was essentially an attention to detail test (VERY easy if you really do have a good attention to detail.)
Then I had a second phone interview with a current EA at Amazon Studios another week or so after that. Unfortunately I didn't make it past this round, but had I, the next step would have been to do a third phone interview and the fourth would have been to come into Amazon and do a 5-6 hour block of back to back 45 minute interviews with various team members there.
You MUST study study study the Amazon Leadership principles and fold them into your responses. Use the STAR method to answer your interview questions. They will ask very specific situational questions and they want you to provide a strong, specific example and to not use the same example in other questions.
I practiced a list of about 30 questions and thought of examples for each one and I still stumbled because the situational questions I was asked weren't exactly the same or they were a little bit deeper/two part questions.