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Updated weekly · Last refresh Oct 17

Moz Data Scientist Interview Questions

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

20questions
~3htotal time
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1
Machine LearningStart here. 7 questions · ~60 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffMoz
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2
Pipelines3 questions · ~26 min
Build ETL for Large-Scale ModelingHard

Tests ETL design, data quality, scalability, and how you prepare data for ML.

SchedulingETLBatch ProcessingMoz
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3
Metrics3 questions · ~26 min
Estimate Feature Impact on ConversionHard

Tests experimental design and causal reasoning for measuring product impact.

Funnel AnalysisConversion RateDiagnosisMoz
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4
More topics7 questions · ~60 min
Microservices vs MonolithMedium

Assesses understanding of system architecture trade-offs relevant to data science platforms.

architecturemicroservicesMoz
Use A/B Testing for Product FeaturesMedium

Tests ability to design experiments, choose metrics, and interpret results correctly.

Confidence IntervalsStatistical SignificanceA/B TestingMoz
Evaluate Classification Model PerformanceEasy

Tests selection of appropriate classification metrics and validation practices.

PrecisionAccuracyRecallMoz
Recommendation System for New ProductMedium

Tests product-oriented ML design, modeling choices, and evaluation approach for recommendations.

User NeedsMVPUse CasesMoz
Handling Missing DataEasy
Practice

Replace missing sales fields with defined defaults and return a consistently ordered dataset.

missing valuesdata cleaningnull handlingMoz
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Rolling 30-Day Active UsersHard
Practice
Practice drill

Calculate daily rolling 30-day active users from a BCG event log using CTEs, date intervals, and distinct aggregation.

Window FunctionsDate FunctionsRunning TotalsThe Boston Consulting GroupJellyfishMoz
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
The finish line: interview-readyComplete all 20 questions plus 2 hands-on drills to finish this plan.