IBM Business Services Data Engineer Interview Questions
The questions to prepare for a IBM Business Services Data Engineer interview. Questions from real interview reports rank first. Updated daily.
Use a hash map to find two array elements that sum to a target in O(n) time.
Scan the array once to track the largest and second largest distinct values in O(n) time.
Implement BFS to traverse a graph level by level from a given start node.
Aggregate posted OneTrust privacy request charges by date and calculate cumulative revenue with a CTE and window function.
Find the second highest salary in each department without using aggregate functions.
Explain normalization for data integrity and when denormalization is useful for faster reporting and simpler analytical queries.
Replace missing sales fields with defined defaults and return a consistently ordered dataset.
University of Minnesota
The Home Depot
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Optimize a PySpark join when one DataFrame is much smaller, focusing on join strategy, shuffle reduction, and practical Spark tuning.
Design the core pipeline infrastructure for a new project, with attention to orchestration, data quality, idempotency, and future scale.