Round 1: Word Search 2 .. completed within 20 mins.
Round 2: System Design for GUID generator for Amazon (Scalable and highly available system)
Round 3: Problem solving round - generate numbers in increamenting order greater than that number and using same digits in that number
Round 4: File System (clean code round)
I prepared for this interview for two months and used Python as my coding language (usually I coded in Java)

I did not clear the interview but I would like to mention that Leetcode is "the" place to start preparing from. I think my lack of real coding was something because of which I didn't clear. Round 1 & 2 went really well but everything went south 3rd onwards