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Updated weekly · Last refresh Aug 30

Whatnot Data Scientist Interview Questions

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

27questions
~4htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~62 min
Reels Cohort 7-Day Rolling RetentionHard
Practice

Use CTEs, joins, and date logic to compute 7-day rolling retention for Instagram Reels cohorts by first-use week.

Whatnot
Rank Sellers by Monthly GMVMedium

Evaluates ability to write ranking queries for seller performance analytics.

RankingData AnalysissqlWhatnot
SQL for Sellers With Degraded FulfillmentHard
Practice
Practice drill

Use CTEs, joins, and conditional aggregation to find top Whatnot sellers with lower shipping fulfillment rates.

sql queryData AnalysisWhatnot
Rank Fastest-Growing Seller RevenueMedium
Practice
Practice drill

Use window functions to rank sellers by month-over-month revenue growth.

Window FunctionsDate FunctionsRankingWhatnot
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2
Metrics5 questions · ~42 min
Investigate GMV Drop Over WeekendMedium

Tests root-cause investigation using metrics, segmentation, and data validation.

Metricsroot cause analysisWhatnot
Diagnosing Engagement DropsMedium

Tests structured debugging of metric anomalies and root-cause analysis.

MetricsDiagnosisuser engagementWhatnot
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3
A/B Testing & Experimentation5 questions · ~42 min
Designing an A/B Test for EngagementMedium

Evaluates experimental design choices for measuring engagement impact.

feature evaluationuser engagementWhatnot
A/B Test for Live RecommendationsHard

Evaluates rigorous experimentation design for recommendation impact measurement.

experimental designWhatnot
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4
Statistics & Probability3 questions · ~25 min
Causal Inference Without RCTsHard

Evaluates causal reasoning and impact measurement strategies under real-world constraints.

Causal Inferenceexperimental designWhatnot
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5
Product Sense3 questions · ~25 min
Metric Framework for New Live CategoryMedium

Evaluates metric framework design for category health and engagement on Whatnot.

product metricsframework designWhatnot
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6
Behavioral & Leadership6 questions · ~51 min
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The finish line: interview-readyComplete all 27 questions plus 2 hands-on drills to finish this plan.