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eBay Applied Scientist Interview Questions

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

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1
Machine LearningStart here. 3 questions · ~24 min
Design a Multi-Armed BanditHard

Design and evaluate a contextual multi-armed bandit that balances exploration and exploitation for Netflix content recommendations.

model selectionexperimental designModel EvaluationeBay
Handle Feature Drift in ProductionHard

Design a production workflow to detect, diagnose, and respond to feature drift without causing unnecessary retraining.

Feature Engineeringdata driftproduction environmenteBay
Loss Function Trade-OffsHard

Explain how loss choice changes optimization, robustness, and business outcomes across real ML projects.

project experiencemodel selectionloss functionseBay
2
More topics2 questions · ~16 min
Measuring Model PerformanceHard

Explain how to select metrics, validation methods, and error analyses appropriate for a model's task and business objective.

performance evaluationevaluation metricsperformanceeBay
Diagnose Production Model UnderperformanceHard

Approach for diagnosing and fixing a model that underperformed after deployment.

Confusion MatrixCalibrationThreshold TuningeBay

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