Dataford
Top 36
Prep plan
Updated weekly · Last refresh Sep 24

The Data Scientist Interview Questions

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

36questions
~5htotal time
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1
SQL & Data ManipulationStart here. 9 questions · ~81 min
3-Month Rolling Average in SQLMedium
Practice

Calculate each user's April three-month rolling interaction average using monthly aggregation, a calendar spine, and window functions.

Window Functionssql queryThe
Top 5% Users by EngagementMedium
Practice

Use a CTE and window function to identify The's top 5% of users by engagement score for the last quarter.

sqluser engagementThe
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2
A/B Testing & Experimentation5 questions · ~45 min
Network Interference in Collaboration TestMedium

Explain when network interference threatens an A/B test, how it biases estimates, and how to redesign the experiment safely.

Network InterferenceExperimentationA/B TestingThe
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3
Product Sense6 questions · ~54 min
Define Metrics for New FeaturesMedium

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

MetricsFeature Prioritizationuser valueThe
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4
Statistics & Probability6 questions · ~54 min
P-Values vs Confidence IntervalsMedium

Tests your ability to communicate statistical results clearly and accurately to non-technical partners.

Confidence IntervalsCommunicationP-ValuesThe
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5
Behavioral & Leadership6 questions · ~54 min
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6
More topics4 questions · ~36 min
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsThe
End-to-End ML System DesignHard

Evaluates your ability to design production-grade ML systems from problem definition through deployment.

designThe
Preventing OverfittingMedium

Evaluates your core machine learning understanding and practical mitigation strategies.

model trainingoverfittingThe
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The finish line: interview-readyComplete all 36 questions to finish this plan.