The first interview was a typical introductory phone call. The second interview was a one-hour technical screen conducted by a third-party company named Karat. In this hour-long interview, I was presented with four different design scenarios in rapid-fire, four-minute sessions, followed by a thirty-minute coding session at the end, which included a full problem statement and test cases.

We were required to use their web IDE, which offered some VS-like editing commands. Unfortunately, the tooling for my chosen language was not robust enough.

After the interview, candidates are (supposedly) given 24 hours to request a redo if they believe they performed poorly. However, I received a rejection email within a few hours of the interview, stating they were not planning to move forward. This was surprising, as I thought I had performed fairly well, given the number of questions and the rapid-fire, game show-esque pace.

Given a software system and some constraints, address the specific questions about that system.