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Updated weekly · Last refresh Oct 17

Whatnot Data Scientist Interview Questions

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

27questions
~4htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~62 min
Rank Sellers by Monthly GMVMedium
Recently asked

Evaluates ability to write ranking queries for seller performance analytics.

RankingData AnalysissqlWhatnot
Reels Cohort 7-Day Rolling RetentionHard
Practice
Recently asked

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

Whatnot
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
Recently asked

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

Metricsroot cause analysisWhatnot
Gather App FeedbackMedium
Recently asked

Assesses ability to translate qualitative feedback into actionable data investigations.

product analysisfeedbackWhatnot
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3
A/B Testing & Experimentation5 questions · ~42 min
Evaluate Tipping Feature ImpactHard
Recently asked

Evaluates experiment design and causal measurement for seller-facing marketplace features.

Whatnot
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4
Statistics & Probability3 questions · ~25 min
Causal Inference Without RCTsHard
Recently asked

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
Recently asked

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

product metricsframework designWhatnot
Evaluating Buyer Tips FeatureMedium
Recently asked

Assesses experimental and observational measurement of a new marketplace monetization feature.

success metricsWhatnot
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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.