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Prep plan
Updated weekly · Last refresh Aug 30

Flatiron Health Data Scientist Interview Questions

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

50questions
~7htotal time
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1
System DesignStart here. 3 questions · ~24 min
2
A/B Testing & Experimentation4 questions · ~32 min
Power Analysis for Survey ExperimentHard

Determine sample size and power for a customer survey or experiment, including MDE, guardrails, and a disciplined decision rule.

MDEPower AnalysisSample SizeFlatiron Health
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3
Model Evaluation4 questions · ~32 min
Validate Model GeneralizationMedium

How to validate that a model will generalize to unseen data using holdouts, cross-validation, and calibration checks.

Hyperparameter TuningCross-ValidationBias-Variance TradeoffFlatiron Health
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4
Machine Learning7 questions · ~56 min
Handling Missing Values in MLEasy

Explain practical strategies for handling missing values in a supervised learning workflow, from diagnosis to modeling and validation.

Cross-ValidationFeature EngineeringRegularizationFlatiron Health
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5
Product Sense3 questions · ~24 min
Define Feature Success MetricsMedium

Framework for choosing a feature's primary success metric and guardrails before launch.

MetricsFeature PrioritizationProduct VisionFlatiron Health
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6
SQL & Data Manipulation14 questions + 3 drills · ~142 min
7
More topics15 questions · ~120 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 IndicatorsDiagnosisFlatiron Health
Batch vs Streaming Data ProcessingEasy

Compare batch and streaming data processing, including when each fits best in a pipeline.

Stream ProcessingETLBatch ProcessingFlatiron Health
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.