The first round of the interview was conducted via video call. During this session, the interviewer asked me a technical question about how I would identify and remove unused code from a company's codebase. Personally, I don’t think this is a particularly strong interview question—it's quite specific and not very applicable across different engineering roles. Unless someone has direct experience with codebase cleanup or large-scale refactoring, they’re unlikely to know the details. Moreover, since the company is a high-frequency trading firm, removing code is generally rare and often avoided due to the high risk of unintended consequences.