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BlueLabs Interview Questions

The questions to prepare for BlueLabs interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~45 min
SQL Rolling Three-Day AverageMedium
Practice

Calculate per-user rolling three-day activity averages for the BlueLabs Activity Insights surface.

BBlueLabs
Handling Missing and Skewed DataMedium

Explain how to handle NULLs, skewed values, and outliers when preparing an analysis dataset using SQL.

Data Qualitynull handlingData WranglingBBlueLabs
Second Attempt Score Per UserEasy
Practice
Practice drill

Use ROW_NUMBER to return each student's second score on a specified Khan Academy exercise.

Data Analysissqluser engagementKhan Academy
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
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2
A/B Testing & Experimentation5 questions · ~42 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchBBlueLabs
Design Test for New FeatureMedium

Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.

experiment designfeature evaluationA/B TestingBBlueLabs
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3
Statistics & Probability5 questions · ~42 min
Conditional Probability ReasoningMedium

Tests your ability to reason with conditional probability and translate it into actionable model improvements.

AccuracyModel EvaluationConditional ProbabilityBBlueLabs
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4
Behavioral & Leadership12 questions · ~101 min
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5
More topics6 questions · ~50 min
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisBBlueLabs
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueBBlueLabs
Handle Missing Or Noisy DataMedium

Evaluates data cleaning strategies and how you protect analysis quality for clients.

data cleaningdata validationBBlueLabs
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The finish line: interview-readyComplete all 31 questions plus 2 hands-on drills to finish this plan.