Dataford
Top 44
Prep plan
Updated weekly · Last refresh Aug 30

Bain & Data Scientist Interview Questions

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

44questions
~7htotal time
Track your progressSign up free to work through all 44 questions and resume where you left off.
Start practicing free →
1
SQL & Data ManipulationStart here. 7 questions · ~64 min
Top Products Rolling Window SQLMedium
Practice

Use aggregation and ROW_NUMBER to find the top three Bain products by revenue in each category over the latest 30 days.

Window FunctionsDate FunctionsRankingBain &
More SQL & Data Manipulation questions with a free account
2
Machine Learning6 questions · ~55 min
Detect Card Fraud with Imbalanced DataEasy

Build an imbalanced binary classifier for card fraud detection using class weighting, resampling, and threshold tuning with PR-focused evaluation.

Hyperparameter TuningCross-ValidationFeature EngineeringBain &
More Machine Learning questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Model Evaluation3 questions · ~28 min
Choose the Right Evaluation MetricMedium

Choose the best metric for a business goal and explain the trade-offs between precision, recall, F1, and threshold choice.

F1 ScorePrecisionAccuracyBain &
More Model Evaluation questions with a free account
4
Statistics & Probability8 questions · ~73 min
A/B Testing for Product FeaturesMedium

Explain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.

Hypothesis TestingStatistical SignificanceA/B TestingBain &
More Statistics & Probability questions with a free account
5
Product Sense5 questions · ~46 min
Engagement Metric for RecommendersMedium

Assesses how you translate product behavior into measurable engagement metrics.

user engagementBain &
More Product Sense questions with a free account
6
A/B Testing & Experimentation6 questions · ~55 min
Handle Sample Ratio MismatchMedium

Assesses your ability to diagnose and mitigate SRM using data and pipeline reasoning.

data pipelineSample Ratio MismatchA/B TestingBain &
More A/B Testing & Experimentation questions with a free account
7
More topics9 questions · ~83 min
Evaluate RAG Retrieved ContextMedium

Explain RAG architecture and how to measure whether retrieved context is relevant, complete, and grounded.

Language ModelsWord EmbeddingsTokenizationBain &
Churn Risk Metrics and ModelingMedium

Tests feature selection, metric choice, and model structuring for churn prediction.

Leading IndicatorsChurnDiagnosisBain &
More questions with a free account
The finish line: interview-readyComplete all 44 questions to finish this plan.