Two rounds of interview. For each round, they asked two behavioral questions (30 mins) and technical questions (30 mins). The interviews are well structured and interviewers are very friendly and professional.

1:self-intro (3min) 2:tough experience (~10min) 3:case that you work out of the scope of your responsibility (~10min) 4:amazon is considering whether to dispense a 10% or 20% coupon on the computing resource, find your way to evaluate the potential result, with only access to the data of Amazon its own but nothing outside the company.