Top 20

Prep plan

Updated weekly · Last refresh Oct 17

Flow Data Scientist Interview Questions

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

20questions

~3htotal time

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Statistics & ProbabilityStart here. 6 questions · ~52 min

Bayesian Updating With Noisy ObservationsHard

Tests Bayesian reasoning and updating under sequential evidence.

Bayesian ReasoningConditional Probability

Flow

Binary Tree Option PricingHard

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

DistributionsConditional Probability

Flow

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Behavioral & Leadership5 questions · ~43 min

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More topics9 questions · ~77 min

SQL Window Functions for Rolling MetricsMedium

Practice

Calculate Snapmint's 30-day rolling average of daily loan defaults using aggregation and window functions.

Data AnalysisAggregations

Flow

Live Experiment PitfallsHard

Tests knowledge of experimental validity threats in production trading environments.

Network InterferencePeekingNovelty Effect

Flow

Handling Collinearity in High-Frequency DataMedium

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

Feature EngineeringBias-Variance TradeoffRegularization

Flow

Primary and Guardrail MetricsMedium

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

North Star MetricKPIGuardrail Metrics

Flow

End-to-End ML for Signal RankingHard

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

Feature StoreRankingModel Serving

Flow

Ridge vs LASSO and SparsityMedium

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

Feature EngineeringBias-Variance TradeoffRegularization

Flow

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min

SQL for Top Categories by RegionMedium

Practice

Practice drill

Write a query to identify the top three selling product categories for each region in the last fiscal quarter. Assume fiscal quarters align with calendar ...

Date FunctionsJoinsRankingBBolia

Fanatics

Walmart Global Tech

SQL Top 10 Active UsersMedium

Practice

Practice drill

Write a SQL query to find the top 10 users with the highest activity in the last month. Treat activity as the number of activity events during the previou...

Date FunctionsJoinsRankingWWeekdayBBoston Tech IndiaCConfidential Client

The finish line: interview-readyComplete all 20 questions plus 2 hands-on drills to finish this plan.