It was one of their data science group. Initially, when the interviewer asked a question on LRU cache design, I solved it using DS, as I assumed the interviewer was expecting the underlying data structure of how a cache would work. I explained it using a doubly linked list and hashmap and coded it – running, neat code with all the methods properly explained and taking care of all edge cases.

Guess what? When he asked me where an interface was, I said we could have one, and I would rather make it an abstract class. It would have a few methods different for the eviction policy and a few common methods.

He didn't even ask me the logic of what I did, since he had no ability to understand the DS or even bothered with what I wrote. He was not even there when I was doing the question, and not one review question on my data structure that I used.

Then he gave me a design question where I wrote two service classes, basic data models, customized exception handling, one server all in one, HR. Checked it out on Git and given it to him.

Basically, I felt they were not technical enough to take your interview. If there was a negative button, I would have given them.

LRU cache design (they were not expecting any DS).

Parking Lot