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Citadel Securities Data Analyst Interview Questions

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

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1
Statistics & ProbabilityStart here. 8 questions · ~70 min
Understanding Type I and Type II Errors in TestingMedium

Differentiate between Type I and Type II errors in hypothesis testing with a practical example.

Hypothesis TestingStatistical SignificanceP-ValuesCitadel Securities
Markov Chains Under PressureMedium

Assesses problem-solving strategy for Markov chain and probability puzzles under time pressure.

Citadel Securities
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2
SQL & Data Manipulation3 questions + 2 drills · ~46 min
Moving Average in SQLHard

Tests SQL window function skills for time-series style analytics.

CodingArray ManipulationCitadel Securities
Assessing Data Quality and RelevanceMedium

Tests data validation, bias checks, and suitability for analytic goals.

Data WranglingAggregationsQualityCitadel Securities
Handling Missing ValuesMedium
Practice
Practice drill

Create an auditable application dataset by applying explicit PostgreSQL rules for missing candidate, status, salary, and date values.

missing valuesdata cleaningnull handlingAircallathenahealthHays
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
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3
Behavioral & Leadership12 questions · ~105 min
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4
More topics5 questions · ~44 min
Scaling Data Pipelines EffectivelyMedium

Approach for building data pipelines that scale in throughput, reliability, and operational visibility.

InfrastructureETLCitadel Securities
Investigating Trading Volume DropsMedium

Tests diagnostic thinking using metrics and identifying likely drivers in markets.

KPILeading IndicatorsDiagnosisCitadel Securities
Experiment for a Trading StrategyHard

Tests experimental design, measurement choices, and risk-aware thinking for trading.

ExperimentationGuardrail MetricsA/B TestingCitadel Securities
Designing a Market Data PipelineHard

Evaluates end-to-end design thinking for data pipelines supporting market data analytics.

data processingsqldesignCitadel Securities
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The finish line: interview-readyComplete all 28 questions plus 2 hands-on drills to finish this plan.