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Updated weekly · Last refresh Oct 17

Slalom Data Engineer Interview Questions

The questions to prepare for a Slalom Data Engineer interview. Questions from real interview reports rank first. Updated daily.

34questions
~6htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 1 drill · ~53 min
SQL Query OptimizationMedium
Practice

Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.

Performance Tuningdatabase optimizationindexesSlalom
Surrogate Key BasicsEasy
Practice

Explain surrogate keys and query current customer dimension records using their generated identifiers.

database designdata integritydimensionsSlalom
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotAvisoHewlett Packard Enterprise
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2
Pipelines12 questions · ~128 min
Data Warehousing in PipelinesEasy

Explain what a data warehouse is and why it matters in analytics pipelines.

InfrastructureETLData ModelingSlalom
Debugging Production Data PipelinesMedium

A structured approach to debugging production data pipelines, with focus on orchestration, data quality, idempotency, and safe backfills.

InfrastructureToolsQualitySlalom
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingSlalom
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3
Coding5 questions · ~54 min
Valid Palindrome DebuggingMedium
Practice

Explain how to diagnose a slow EMR Spark palindrome job while preserving efficient filtering, partitioning, and DataFrame I/O.

CodingArraysDebuggingSlalom
SQL and Python Data StructuresMedium
Practice

Aggregate numeric values by key using a Python hash map and explain when SQL is the better execution layer.

CodingData StructuressqlSlalom
Coding Foundations for DataMedium
Practice

Use topological sorting to order coding fundamentals while respecting prerequisite relationships.

CodingData StructuresAlgorithmsSlalom
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4
Behavioral & Leadership13 questions · ~139 min
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The finish line: interview-readyComplete all 34 questions plus 1 hands-on drill to finish this plan.