Amazon Software Engineer II SDE2 interview questions

1. Design an API for amazon locker system - and scale later 2. Design tinyUrl 3. Review a user given code and point out issues(multi threading related question for unbounded range storage, range is based on expiry date) 4. List of words, map all words(subStrings) that can make up any word(string) within the list. 5. roulette random weighted distribution, [1,2,4,8] = total = 15, weights = 8/15, 4/15, 2/15, 1/15. write a random number generation based on the weights.