System design interview question
"Design a system that schedules technical interviews. Each interview needs a candidate, one or more interviewers with the right skills, and a room or video link — all free at the same time. A loop may be four interviews in sequence on the same day. Recruiters complain that scheduling a single loop takes hours of manual work."
constraint satisfaction over calendars, which is a genuinely hard combinatorial problem hiding behind a mundane-sounding product. The discriminating insight is that this is not "find a free slot" — it is finding a set of mutually compatible slots across multiple people, and the search space explodes.
On Practick another engineer interviews you live for 60 minutes on a question from this bank. They have the full interviewer guide beside the call: the answers to your clarifying questions, the numbers to hand out, a ladder of follow-ups and a scoring rubric. You get the model solution once the session settles. It is free: interview someone for an hour and you have earned your own.
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