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Arthur J. Gallagher & Data Engineer Interview Questions

The questions to prepare for a Arthur J. Gallagher & Data Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
PipelinesStart here. 7 questions · ~64 min
Model Analytics Warehouse for RetailEasy

Design an ELT pipeline and warehouse data model in Snowflake for retail analytics, including dimensional modeling, orchestration, and data quality.

InfrastructureData ModelingQualityArthur J. Gallagher &
Integrating Multiple Data SourcesEasy

Common pipeline issues when combining multiple data sources, including schema mismatch, data quality, orchestration, and duplicate handling.

ETLData ModelingQualityArthur J. Gallagher &
Structured vs Unstructured DataEasy

Explain how structured and unstructured data differ, and why that matters for pipeline design and downstream processing.

ETLData ModelingQualityArthur J. Gallagher &
Design an End-to-End Data PipelineMedium

Approach for designing an end-to-end data pipeline from ingestion through transformation, storage, and downstream consumption.

data pipelinedesigningestionArthur J. Gallagher &
Data Governance in PipelinesMedium

Describe a practical approach to data governance across shared data pipelines, including quality, ownership, lineage, and controlled data access.

InfrastructureQualityArthur J. Gallagher &
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2
More topics3 questions · ~28 min
SQL Average Sales Per MonthEasy
Practice

Calculate average sale amount by month using date filtering, grouping, and AVG aggregation.

sqlAggregationsArthur J. Gallagher &
Memory-Efficient Dataset MergeMedium

Tests algorithmic thinking and efficiency for large-scale data merges.

Hash TablesArraysTwo PointersArthur J. Gallagher &
Optimizing SQL PerformanceMedium

Tests query tuning skills such as indexing, execution plans, and efficient SQL patterns.

JoinsData WranglingAggregationsArthur J. Gallagher &

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Monthly Team Performance Cost AnalysisMedium
Practice
Practice drill

Use joins, a CTE, and date aggregation to calculate monthly team volume, average turnaround time, and cost per unit.

Date FunctionsJoinsGroup ByArthur J. Gallagher &Unity TechnologiesVirtual Employee
Top 3 Policies Per RegionEasy
Practice
Practice drill

Use ROW_NUMBER and a region join to identify the three highest-grossing active policies in each region.

Window FunctionsRankingAggregationsArthur J. Gallagher &State Farm
The finish line: interview-readyComplete all 10 questions plus 2 hands-on drills to finish this plan.