Onsite interview. Firstly I needed to pass online assesment, 2 coding challenges in 90 minutes. I prepared myself from Leetcode website. After that I had phone interview, one coding challenge in 30 minutes. And behavioral questions before that. Then I was called on onsite interview. Typical Amazon onsite interview, 4 sessions, 2 coding challenges, 1 OOP design, 1 system design, a lot of behavioral questions.