Software Engineer applicants have rated the interview process at Amazon with 3.5 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 33% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
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I applied through college or university. The process took 2 days. I interviewed at Amazon in Oct 2013
Interview
On-campus interview. I had a 45-minute initial interview that covered high-level web-systems architecture questions, where we talked it out and drew some diagrams. No coding. Then had a callback for another on-campus interview 2 days later, where each of 3 interviewers started with some personal questions, and then asked very feasible coding questions that I answered on paper. Got an offer later that night.
Interview questions [1]
Question 1
Nothing too crazy, really. Just know straightforward algorithm/coding techniques, and be prepared to work in pen/paper in a language you're comfortable with. They were understanding about not knowing the exact methods for language API calls, etc.