Simple, three rounds; be prepared with a lot of leetcode easy to medium difficulty practice. Preparation is simple, execution is hard due to time limit. As long as you practice consistently, you can succeed.
After resume is 3 rounds of online assessments
1) Debugging 7 problems in 20 minutes
2) 2 regular coding problems (not too difficult) and a survey about your habits/personality
3) Work Life Simulation
They gave me an Online assessment that was comprised of a coding challenge, debug portion, as well as a workplace simulation that asked a variety of decision questions around what one would do in that situation at Amazon.