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eBay Research Scientist Interview Questions

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

12questions
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1
Machine LearningStart here. 5 questions · ~40 min
Handling Label Noise at ScaleMedium

Tests your ability to design robust training strategies under noisy supervision.

Data QualityeBay
Loss Function Trade-offsMedium

Tests your understanding of how loss choices affect optimization, calibration, and metrics.

Classificationloss functionsTrade-offseBay
Improving eBay Image RetrievalHard

Tests your approach to diagnosing retrieval problems and designing an ML plan for eBay-scale data.

eBay
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2
More topics7 questions · ~56 min
Optimizing Training Pipeline MemoryMedium

Tests your ability to improve training efficiency through memory-aware engineering choices.

system designmodel trainingeBay
Deriving Uniform DistributionsMedium

Tests your ability to reason about probability distributions and derive results for uniform cases.

eBay
Efficient Nearest Neighbor QueryingHard

Tests your ability to design and reason about efficient nearest-neighbor search methods.

query optimizationData StructureseBay
Defining Production ReadinessMedium

Tests your ability to define acceptance criteria using metrics, risk, and operational constraints.

Decision Makingproduction deploymentModel EvaluationeBay
From-Scratch ML ImplementationHard

Tests your fundamentals by evaluating correct implementation details and algorithmic understanding.

coding challengeMachine LearningimplementationeBay
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