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Updated weekly · Last refresh Aug 30

Capital One Data Scientist Interview Questions

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

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1
SQL & Data ManipulationStart here. 9 questions · ~87 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Recently asked

Calculate the monthly spending trends for customers using window functions and joins.

Capital One
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2
Model Evaluation4 questions · ~39 min
ROC Curve and Confusion MatrixEasy
Recently asked

Explain how to build and interpret a ROC curve and confusion matrix, and how they map to business outcomes.

ClassificationConfusion MatrixAUC-ROCCapital One
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3
System Design5 questions · ~48 min
Design a Card Offer Ranking SystemHard
Recently asked

Design a ranked card offer experience that personalizes offers, handles delayed conversion signals, and stays fresh as customer behavior changes.

Feature StoreModel ServingCapital One
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4
Machine Learning9 questions · ~87 min
Random Forest vs GBM for Credit RiskMedium

Evaluates your model selection reasoning for high-stakes credit risk use cases.

Ensemble MethodsBias-Variance TradeoffDecision TreesCapital One
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5
Statistics & Probability4 questions · ~39 min
Backtesting Credit Default ForecastsHard

Tests your ability to design robust backtesting for long-horizon credit risk forecasting.

Cross-ValidationTime SeriesCapital One
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6
Behavioral & Leadership13 questions · ~125 min
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7
More topics6 questions · ~58 min
Merge Sorted Customer ID ArraysEasy
Practice
Recently asked

Merge two sorted arrays using two pointers and remove duplicates in one pass.

deduplicationArraysSortingCapital One
A/B Test for Credit Limit IncreasesMedium

Assesses your experimental design and statistical rigor for credit decisioning at scale.

Guardrail MetricsSample SizeA/B TestingCapital One
Process Data for Model TrainingMedium

Evaluates your data preprocessing pipeline design to avoid leakage and ensure consistent features.

data processingCapital One
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