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Citadel Securities Data Scientist Interview Questions

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

36questions
~5htotal time
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1
Machine LearningStart here. 6 questions · ~48 min
Handle Highly Imbalanced ClassesMedium

Build a classifier for a highly imbalanced dataset and choose training and evaluation methods that surface rare positives.

Cross-ValidationFeature EngineeringSupervised LearningCitadel Securities
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2
Statistics & Probability7 questions · ~56 min
Vectorized Monte Carlo for OptionsMedium

Tests simulation design, performance optimization, and Python vectorization skills.

vectorizationsimulationCitadel Securities
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3
Behavioral & Leadership16 questions · ~128 min
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4
More topics7 questions · ~56 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchCitadel Securities
Reconciling Discrepant Financial DataMedium

Explain how to reconcile discrepant financial datasets using joins, CTEs, aggregations, and exception classification.

JoinsData WranglingQualityCitadel Securities
First Checks for Metric DropsEasy

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosisCitadel Securities
Design Product Metrics FrameworkMedium

Tests product measurement design and ability to define reliable leading and safety metrics.

North Star MetricGuardrail MetricsLeading IndicatorsCitadel Securities
Near-Real-Time Market Data PipelineHard

Tests pipeline architecture, data quality validation, and monitoring design for market data.

Data QualityStream ProcessingmonitoringCitadel Securities
Marketing Campaign A/B Test DesignMedium

Design a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.

ExperimentationHypothesis TestingA/B TestingCitadel Securities
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Region VolumeMedium
Practice
Practice drill

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankNavi
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 Delayed Routes by RegionMedium
Practice
Practice drill

Use a CTE and window ranking to find the top 3 routes with the highest average delay in each region.

Window FunctionsJoinsRankingCoca-Cola ConsolidatedAPL LogisticsFlexport
The finish line: interview-readyComplete all 36 questions plus 3 hands-on drills to finish this plan.