Yahoo Data Engineer Interview Questions
The questions to prepare for a Yahoo Data Engineer interview. Questions from real interview reports rank first. Updated daily.
Compute a B-Tree's height with recursive traversal, returning the number of levels from root to leaf.
YahooFind and reconstruct a longest strictly increasing subsequence using dynamic programming and binary search.
YahooAggregate Yahoo Mail messages and ad clicks by day using joins, CTEs, date extraction, and conditional aggregation.
YahooCalculate Yahoo Mail monthly cohort retention with multi-level CTEs, calendar periods, deduplicated activity, and retention percentages.
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Design a two-tower candidate retrieval system for a large personalized feed with 600M items and tight latency budgets.
YahooRedesign a slow Databricks Spark ETL pipeline to cut runtime from 3 hours to under 60 minutes without breaking data quality or SLAs.
YahooDesign a streaming pipeline that can absorb late-arriving events while keeping aggregates correct and downstream tables stable.
YahooAssesses your understanding of core design trade-offs for distributed data systems.
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