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Design an event recommendation system (events, jobs, or other time-sensitive items).

Recommending events (or jobs) breaks normal recsys in two places: items expire and items are local. The signal is how you handle perishability, geography, and the fact that every item is a cold-start item. Here is the design.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Recommending events (or jobs) breaks normal recsys in two places: items expire and items are local. The signal is how you handle perishability, geography, and the fact that every item is a cold-start item. Here is the design.

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Next in this trackDesign a large-scale text classification system (e.g. news categorization or topic tagging).Next in this trackHow do you handle feedback loops and bias in a recommendation system?Next in this trackDesign a data labeling / annotation platform.
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