Screening Round

1. A simple weighted grouping question.
   Given groups corresponding to each weight:
   For eg:
   100-200 -> Light weight
   200 - 300 -> mid weight
   400 - 500 -> heavy weight
   tell the frequency in each group and return min and max.
   Key here was, do it as system design, make all classes etc.

2. Buy and Sell stock unlimited number of times

On-site one

1. Top k frequent elements
2. Sudoku Solver
3. Merge Intervals
   You are expected to do only 2..I did 3 because I was quick to solve the first two

On-site two

1. Standard behavioural questions

On-site three

1. Implement ls-r
   given directory structure as dictionary, return all files within one directory and subdirectories.
   You can do a simple sort and binary search but I made the mistake of doing it with tries. They are more interested in overall development and want unit tests etc also, not just the best most optimised algo, although I would argue in this case, trie is no entirely better than binary search

On-site four

System design round, was asked to implement an online flash sale
It got really deep, where I was expected to write even deep level api calls, handle mutex, optimisitic locking, pessimistic locking etc

Verdict: Downlevelled from senior to mid, did not meet salary expectations so did not take the offer.