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Block Interview Questions

The questions to prepare for Block interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 13 questions + 2 drills · ~129 min
2
Pipelines14 questions · ~117 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityBlock
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityBlock
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3
Execution7 questions · ~59 min
Prioritize Across Competing Data ProjectsEasy

Explain how you prioritize across multiple concurrent data engineering projects with competing stakeholder needs and limited capacity.

Trade-offsRoadmappingScope ManagementBlock
Plan a Phased Operations RolloutMedium

Plan a phased rollout for a new operational initiative with clear stages, success criteria, and risk controls.

Launch Planningphased rolloutsProject ManagementBlock
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4
Metrics3 questions · ~25 min
Design an Operations KPI HierarchyMedium

Build a KPI hierarchy that links frontline operational signals to business outcomes and supports better decisions.

operational metricsperformance measurementkpi hierarchyBlock
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5
Coding7 questions · ~59 min
Memory-Optimized Streaming AlgorithmsHard

Tests streaming algorithm thinking under tight memory constraints.

ArraysGreedyTwo PointersBlock
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6
Behavioral & Leadership4 questions · ~33 min
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7
More topics2 questions · ~17 min
Close a Difficult DealMedium

Show how you rescued a hard deal by aligning stakeholders, handling conflict, and driving the close.

Stakeholder ManagementCommunicationOwnershipBlock
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.