DataScan Interview Questions
The questions to prepare for DataScan interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Use two pointers to determine whether a PenFed member-note string reads identically forward and backward.
DataScanReverse a string in Python using character traversal and return the reversed result.
DataScanUse a hash map to find two array elements that sum to a target in O(n) time.
DataScanExplain how you would diagnose and recover a project that is falling behind schedule without losing stakeholder trust.
DataScanExplain how you would balance technical debt reduction with feature delivery when stakeholders want visible progress but engineering risk is rising.
DataScanTests incident triage, debugging workflow, and communication during outages.
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Tests your ability to improve query performance and reason about database execution.
DataScanEvaluates your approach to diagnosing and improving performance in production-scale systems.
DataScanRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoUse ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.
Replit
QuantcastCompute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.
Gain Digital
TCS
Zest AI