HackerRank Data Engineer Interview Questions
The questions to prepare for a HackerRank Data Engineer interview. Questions from real interview reports rank first. Updated weekly.
Flatten a deeply nested JSON-like object into path-value pairs using recursion and deterministic key construction.
Tests practical implementation skills for distributed data transformations.
Tests data governance practices including validation, compatibility, and evolution handling.
Tests system design for streaming or near-real-time ingestion with correctness guarantees.
Tests pipeline implementation thinking for multi-source ingestion and analytics readiness.
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Tests handling of null semantics and numeric/string formatting in analytical SQL.
Tests query optimization techniques for performance on large-scale datasets.
Tests understanding of SQL analytical patterns and when to use window functions vs aggregation.
Rank the three most active HackerRank users in each challenge category using joins, GROUP BY, and ROW_NUMBER().
Calculate rolling 30-day distinct OnStar users using a deduplication window function and date-range aggregation.
General Motors (GM)Calculate each paper's citation count and the average across Elsevier-indexed papers in a date range using a window function.
Elsevier