Total exp: 3 years (2 years service based + 1 year product based)

Round 1:
Online assessment, two questions of medium difficulty. Was able to solved both and was moved to the next round.

Round 2(DSA):

• First question: Given string of characters, lower case and can have repeating chars. Re-arrange the string so that repeating chars are not next to each other. Eg: Input>aaabbc, output-> ababac or ababca
• Second question: Given a postfix expression, convert it to the expression tree.

Was able to solve first question in 40 mins, with working code and for 2nd question discussed and coded the pseudo code using stack.

Round 3(DSA):

• You have a board of snake and ladders with 1 to 100 as numbers. Also given some ladders and snakes in form of starting and ending points. You have to find the minimum number of dice rolls required to reach the 100 position.

Did it with using bfs, took around 40 mins to code completely. Interviewer was satisfied and asked some basic LP questions/scenarios.

Round 4(HLD+Hiring manager):
Interview was Senior SDM(14 yrs of exp), having big dark circles, lol. She did some discussions around my team's work. As I was in payments team and unfortunately she was also familiar with this system.
P.S.: I have worked in payments team for last one year only.
She asked me to design payments engine, enough to handle a million txn a day. No specific requirements was given. I started building requirements, was able to come up with only basic ones.
I started with the payments flow, she asked me what about validations, then I tried to do some validations on user.
After a while the conversation went to making HLD diagrams, what db to use. I suggested SQL for txn properties, but she was concerned about scaling. I introduced master/slave and archival DBs, still was not convinced.
After spending around 50 mins on this, she asked some basic LP principles and ended the interview.

Result: Rejected by Hiring manager
P.S: This was my third attempt at Amazon, so yes its a hat-trick for me at rejections from Amazon. Not at all sad, just saying.

Hope this helps
Cheers !