eBay AI Engineer Interview Questions

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

Design Personalized Marketplace Search Ranking

Hard

Design a personalized marketplace search ranker for 180M products at 420K peak QPS with tight latency and freshness constraints.

Trade-offsRoadmappingRisk Assessment

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Evaluate Models in Production

Hard

How to evaluate a production model using calibration, thresholds, and confusion matrix tradeoffs.

CalibrationAccuracyThreshold Tuning

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Feature Engineering for Sparse Data

Medium

Explain how to engineer features for high-dimensional sparse data while controlling overfitting, dimensionality, and training cost.

data preprocessingFeature Engineeringsparse datasets

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Recommendation Model Architecture Trade-offs

Medium

Tests ability to compare model architectures and justify choices for eBay recommendation use cases.

model architectureTrade-offsRecommendation Systems

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Designing a Large-Scale RAG Pipeline

Hard

Tests advanced generative AI system design for retrieval, grounding, and scalable production behavior.

system design

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Embeddings and Vector Search

Medium

Tests NLP and retrieval design for recommendation quality using embeddings and vector search.

Vector Search

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