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Updated weekly · Last refresh Sep 21
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FDJ UNITED Data Scientist Interview Questions

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

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~2htotal time
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1
A/B Testing & ExperimentationStart here. 3 questions · ~25 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchFFDJ UNITED
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2
Machine Learning3 questions · ~25 min
AUC: Definition and PitfallsMedium

Tests knowledge of evaluation metrics and potential misinterpretations.

model performanceFFDJ UNITED
Collaborative vs Content-Based FilteringMedium

Measures understanding of recommender system approaches tailored to FDJ UNITED products.

Recommendation SystemsFFDJ UNITED
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3
Behavioral & Leadership5 questions · ~41 min
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4
More topics5 questions · ~41 min
Diagnose Engagement DropHard

Identify the causes of a quarterly engagement decline through metric validation, decomposition, segmentation, and trend analysis.

MetricsDiagnosisuser engagementFFDJ UNITED
Balance Conversion and RetentionHard

Framework for deciding when to favor short-term conversion gains versus long-term retention in a product decision.

Feature PrioritizationUser NeedsValue PropositionFFDJ UNITED
Correlation vs Causation in AnalysisEasy

Explain why two metrics moving together does not prove that one causes the other, and how to assess causality more carefully.

RegressionCorrelationCausal InferenceFFDJ UNITED
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueFFDJ UNITED
Assessing Findings in Data AnalysisMedium

Tests statistical rigor and interpretation of analysis results within FDJ UNITED context.

Data AnalysisStatistical SignificanceassessmentFFDJ UNITED

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