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Updated weekly · Last refresh Aug 30

Flow Data Scientist Interview Questions

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

20questions
~3htotal time
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1
Statistics & ProbabilityStart here. 6 questions · ~48 min
Bayesian Updating With Noisy ObservationsHard

Tests Bayesian reasoning and updating under sequential evidence.

Bayesian ReasoningConditional ProbabilityFlow
Binary Tree Option PricingHard

Tests quantitative finance fundamentals and modeling options with time-varying volatility.

DistributionsConditional ProbabilityFlow
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2
Behavioral & Leadership6 questions · ~48 min
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3
More topics8 questions · ~64 min
Live Experiment PitfallsHard

Tests knowledge of experimental validity threats in production trading environments.

Network InterferencePeekingNovelty EffectFlow
Handling Collinearity in High-Frequency DataMedium

Tests feature engineering and modeling strategies for multicollinearity in trading data.

Feature EngineeringBias-Variance TradeoffRegularizationFlow
Primary and Guardrail MetricsMedium

Tests metric design for strategy evaluation and risk-aware guardrails in trading.

North Star MetricKPIGuardrail MetricsFlow
End-to-End ML for Signal RankingHard

Tests ML system design for production trading, including monitoring and resilience.

Feature StoreRankingModel ServingFlow
SQL Pre vs Post Change AnalysisMedium

Tests SQL skills for causal-ish comparisons and robust time-windowed aggregations.

Date FunctionsJoinsAggregationsFlow
Ridge vs LASSO and SparsityMedium

Tests regularization intuition and ability to choose methods for sparse signal selection.

Feature EngineeringBias-Variance TradeoffRegularizationFlow
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.