Had a horrible interview experience (3rd round) System Design on paper: but went into tool-specific in-depth. I do not understand how anyone can remember tool-specific details without prep. The audacity of the intreviewer to tell me that "only with enough too depth can someone design a good system". Sure, but it needs to be communicated upfront so that the candidate can refresh. Takes 2 weeks at the minimum to get any response from the team post an interview.