To get in all you need is to clear the technical and behavioral interview. I participated in over 300 interviews, and not once was education ever brought up as a factor. Amazon in Seattle hires hundreds of people a week, and there's plenty of openings in other places. Just find a position you think is a good fit and apply. If you know someone working there it'd be good to get a referral, but it's not required. I just applied from their website in 2010, and I started 3 weeks later.