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Prep plan
Updated weekly · Last refresh Aug 30

the LEGO Group Data Engineer Interview Questions

The questions to prepare for a the LEGO Group Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~45 min
2
Pipelines42 questions · ~346 min
Privacy Compliance in Data PipelinesMedium

Approach for building privacy controls, lineage, and auditability into data pipelines that handle personal data.

Compliancedata privacyPipelinesthe LEGO Group
Design Cloud ETL Migration PipelineEasy

Design a cloud-native batch ETL platform on AWS or Azure for 2.5 TB/day of mixed-source data with orchestration, quality checks, and incremental loads.

InfrastructureToolsQualitythe LEGO Group
Choosing Batch vs Real TimeHard

Evaluate when a pipeline should use stream processing versus scheduled batch based on latency, cost, complexity, and data quality needs.

Stream ProcessingBatch ProcessingDependenciesthe LEGO Group
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3
Coding3 questions · ~25 min
Peer Programming Round ExperienceMedium

Assesses your ability to collaborate and perform in a peer programming setting.

collaborationthe LEGO Group
Modular ETL in PythonMedium

Evaluates your software engineering practices for maintainable, testable ETL and validation logic.

Hash TablesArraysSortingthe LEGO Group
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4
More topics2 questions · ~16 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.