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WorldQuant Data Scientist Interview Questions

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

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1
Statistics & ProbabilityStart here. 17 questions · ~137 min
Expected Flips for Two HeadsMedium

Compute the expected waiting time to see two consecutive heads when flipping a fair coin.

DistributionsExpected ValueConditional ProbabilityWorldQuant
Max of Three Dice ProbabilityMedium

Tests probability modeling for discrete random variables and deriving exact distributions.

DistributionsExpected ValueConditional ProbabilityWorldQuant
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2
SQL & Data Manipulation5 questions + 3 drills · ~70 min
SQL Rolling Stats With WindowsMedium

Tests SQL window function fluency for time-series style feature engineering and grouped ranking.

Window FunctionsRankingRunning TotalsWorldQuant
Pre vs Post Intervention SQLMedium

Tests ability to structure SQL for causal-style comparisons with windows and group-level metrics.

Window FunctionssqlAggregationsWorldQuant
Rank Top Clients by Product RevenueEasy
Practice
Practice drill

Use a CTE, joins, and RANK() to find the top 2 clients by revenue for each product from completed 2024 orders.

Window FunctionsRankingAggregationsGooglePublicis GroupeRTX
SQL Rolling Average and RankingHard
Practice
Practice drill

Use CTEs and window functions to calculate 7-day transaction averages and rank Loft users within each region.

Window FunctionsRankingRunning TotalsLoftArcadisCgi Nederland
Top Merchants by CityMedium
Practice
Practice drill

Rank the top three DoorDash merchants per city by 30-day revenue using joins, aggregation, date filtering, and ROW_NUMBER.

Window FunctionsRankingAggregationsDoorDash
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3
Machine Learning4 questions · ~32 min
Black-Scholes Limits for American OptionsHard

Tests quantitative finance understanding and ability to connect model assumptions to numerical solutions.

Feature EngineeringModel EvaluationSupervised LearningWorldQuant
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4
Behavioral & Leadership18 questions · ~145 min
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5
More topics6 questions · ~48 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 IndicatorsDiagnosisWorldQuant
Define Metrics for New FeaturesMedium

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

MetricsFeature Prioritizationuser valueWorldQuant
Ranking Test for App DiscoveryMedium

Design an A/B test for a new app-store ranking algorithm, including primary metrics, guardrails, sample size, and launch criteria.

MDEGuardrail MetricsSample Ratio MismatchWorldQuant
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