OA:
Coding
2 Coding questions on Hackerrank. Solved first one completely and half of 2nd done.
HLD & LLD Questions:
Custom Amazon portal where situation was provided and you have to answer based 4 5 design based questions on the situation. there were 6 7 situations in total.
I got a call from recruiter aftercompleting the online assessment on Hackerrank regarding offline interviews. First 3 rounds were conducted offline and last one was online after 2 weeks.
Round 1 (DSA):
Q1: Same question, different situation: https://leetcode.com/problems/koko-eating-bananas/ --> Solved Fully
Q2: https://leetcode.com/problems/pacific-atlantic-water-flow/ -> Explained the approach but coudn't complete psuedocode
2 Behavioural questions based on Amazon LPs.
Round 2 (LLD):
Chess LLD
This was the most difficult round, he asked for:
- API calls, requests & responses for each
- Class structure
The interviewer was nice, even though he grilled on the design for 1.5 on the design. We had a really good discussion on design and he allowed to make improvements on the design I first proposed based on his comments.
2 Behavioural questions based on Amazon LPs.
Round 3 (HLD):
The interview started with almost 5 to 6 behavioural questions based on Amazon LP and then we moved to Design Problem.
I was asked to design an Anomaly Detection System. He gave pretty clear requirements regarding the system. Basically, if there is a normal systen with an increase in transaction of 1000% than average for an unspecified time period it may or may not count as an anamoly but it needs to be checked out with stopping any of the transactions from going through.
I explained multiple approaches:
- Messaging Queues for shorter time window
- DBs for larger windows
Round 4 (Bar Raiser):
2 Behavioural questions based on Amazon LPs.
Coding Question: https://leetcode.com/problems/maximum-tastiness-of-candy-basket/
For HLD:
Please read Designing Data Intensive Applications book by Martin K. It's really helpful for HLD foundation. For Questions and different HLD, read System Design Interview Vol 1 & Vol 2 by Alex Xu
To Study Questions Related to Amazon LPs:
There are few github repos that have around 50 60 amazon LP.
Other sources:
- Use ChatGPT with prompt asking 3 questions on all 16 LPs.
- Google "Scarletink Amazon Leadership Principles". The article is really good.