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Updated weekly · Last refresh Sep 20

PayPal Data Scientist Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 13 questions · ~114 min
SQL Missing Marks RuleEasy
Practice

Use GROUP BY and HAVING to exclude students missing marks in two or more subjects.

data cleaningsqlPayPal
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2
Machine Learning11 questions · ~97 min
Detect Rare Payment FraudMedium

Build an imbalanced binary classifier for payment fraud detection using cost-sensitive learning, threshold tuning, and precision-recall evaluation.

Cross-ValidationFeature EngineeringSupervised LearningPayPal
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3
Statistics & Probability3 questions · ~26 min
Evaluating Observed Lift SignificanceMedium

Explain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.

Confidence IntervalsStatistical SignificanceP-ValuesPayPal
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4
A/B Testing & Experimentation3 questions · ~26 min
Design an A/B TestMedium

Evaluates experimentation design and practical risk-aware measurement thinking.

experiment designPayPal
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5
Product Sense3 questions · ~26 min
Approach a Crypto ProductMedium

Evaluates product sense and how you would translate product goals into data science thinking.

PayPal
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6
Behavioral & Leadership11 questions · ~97 min
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7
More topics6 questions · ~53 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 IndicatorsDiagnosisPayPal
Explain LSTM, RNN, and LLM Fine-TuningHard

Assesses understanding of sequence models and practical LLM fine-tuning concepts.

Fine-TuningPayPal
Understanding Confusion MatricesMedium

Evaluates understanding of classification metrics and practical model evaluation.

evaluation metricsMachine LearningPayPal
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