OfferUp Data Engineer Interview Questions
The questions to prepare for a OfferUp Data Engineer interview. Questions from real interview reports rank first. Updated weekly.
Explain how to diagnose and optimize a slow PostgreSQL query on large Apidel Technologies datasets.
OfferUpTests advanced SQL skills for aggregating marketplace user activity with joins and window functions.
OfferUpEvaluates understanding of how indexing choices affect query performance and storage tradeoffs.
OfferUpUse ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.
ReplitMerge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.
ArtefactRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoExplain how to derive time and space complexity for a coding solution and justify the final Big O bounds.
OfferUpTests array and frequency counting techniques to identify the first unique element.
OfferUpTests understanding of consistency models, trade-offs, and correctness strategies.
OfferUpAssesses practical data engineering skills for ingestion, transformation, and schema mapping.
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Tests prioritization and ownership when balancing technical debt with feature delivery under stakeholder pressure.
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