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Updated weekly · Last refresh Aug 30

GALLO Data Analyst Interview Questions

The questions to prepare for a GALLO Data Analyst interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~46 min
Find Duplicate Records in SQLEasy
Practice

Use GROUP BY and HAVING to find duplicate patient records in a Johns Hopkins Medicine dataset.

Data WranglingGroup ByHavingGALLO
Analyze Decision Impact by RegionEasy
Practice
Practice drill

Use joins, CASE WHEN, and date filtering to compare outcome rates before and after a decision.

Data WranglingDiagnosisAggregationsHarbourVest Partners
Identify Funnel Bottlenecks in OnboardingHard
Practice
Practice drill

Use joins, CTEs, and aggregations to find the weakest step in an onboarding funnel and estimate lost conversions.

Funnel AnalysissqlDiagnosisAtlassianRevolut
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2
Metrics10 questions · ~87 min
Diagnose Churn by Customer SegmentMedium

Investigate why one customer segment drives most churn and what actions to take.

User SegmentsChurnDiagnosisGALLO
Using Metrics to Drive DecisionsEasy

Explain how you used a KPI and supporting metrics to diagnose a product issue and make a concrete product decision.

Funnel AnalysisKPIsLeading IndicatorsGALLO
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3
Behavioral & Leadership4 questions · ~35 min
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4
More topics5 questions · ~44 min
Large Dataset Analysis PipelineEasy

Discuss a large-scale data analysis project with focus on the pipeline, tooling, and data quality approach.

ToolsData ModelingQualityGALLO
Determining A/B Test SignificanceMedium

Explain how to evaluate whether an A/B test result is statistically significant and how to interpret the result.

marketing experimentStatistical SignificanceAnalysisGALLO
Why You Want GALLOEasy

Tests motivation and alignment with GALLO's culture and business.

Value PropositionProduct VisionGALLO
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityGALLO
Campaign Effectiveness MeasurementMedium

Tests your ability to define metrics, choose appropriate analyses, and interpret results for marketing impact.

Confidence IntervalsHypothesis TestingA/B TestingGALLO

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