A technical interview. There were two interviewers: the direct manager and a more senior one - both somewhat hostile and unpleasant types.

They asked some basic personal questions and then a design question and an algorithmic question.

You are given files with model specifications and files of metadata for them. Each specification file can have multiple metadata files associated with it. Design a system where you can search metadata files by the UID of the associated specification file and vice versa. Support efficient reassignment of metadata files to specification files.