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Arthur J. Gallagher & Data Scientist Interview Questions

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

50questions
~7htotal time
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1
Machine LearningStart here. 7 questions · ~57 min
2
Pipelines7 questions · ~57 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityArthur J. Gallagher &
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3
NLP8 questions · ~65 min
Explain Context Processing in LLMsEasy

Build a transformer-based demo that explains tokenization, embeddings, self-attention, and next-token prediction for legal and technical text.

Neural NetworksLanguage ModelsTokenizationArthur J. Gallagher &
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4
Statistics & Probability7 questions · ~57 min
Interpreting Significance in ExperimentsMedium

Explain statistical significance in experiments and how p-values and confidence intervals guide interpretation.

Confidence IntervalsStatistical SignificanceP-ValuesArthur J. Gallagher &
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5
Model Evaluation7 questions · ~57 min
Assessing Model OverfittingMedium

Explain how to determine whether a model is overfitting, using validation performance and generalization checks.

Cross-ValidationBias-Variance TradeoffAccuracyArthur J. Gallagher &
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6
Product Sense3 questions · ~24 min
Align Product With User NeedsMedium

A framework for connecting user needs to business goals, then making product decisions with clear trade-offs and measurable outcomes.

User NeedsValue PropositionProduct VisionArthur J. Gallagher &
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7
More topics11 questions · ~89 min
Prioritize KPIs for a DashboardEasy

Choose a focused KPI set for a new dashboard by tying metrics to product value, business goals, and leading versus lagging signals.

KPIsLeading IndicatorsDiagnosisArthur J. Gallagher &
SQL Joins, Aggregations, WindowsMedium

Evaluates ability to write correct and efficient SQL for complex analytics queries.

Window FunctionsJoinsAggregationsArthur J. Gallagher &
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.