Leetcode Medium.
Just do your Leetcode and read the Amazon Leadership Principles.
If you need to make something up to match the principles, then that might be your best bet.
What is your most innovative project?
The following metrics were computed from 12 interview experiences for the Amazon SWE role in United States.
Amazon's interview process for their SWE roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Amazon's SWE interview process in United States.