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Updated weekly · Last refresh Aug 30

Amazon Applied Scientist Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 12 questions · ~126 min
Matrix Factorization RecommendationHard
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Train user and item latent factors with SGD, then recommend unseen Amazon items by predicted rating.

Amazon
Implement Binary Search AlgorithmEasy
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Write a binary search function to find a target value in a sorted array.

SearchingAmazon
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2
System Design13 questions · ~136 min
Design Feature Drift Monitoring SystemHard
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Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingAmazon
Choose Online vs Batch ServingHard
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Choose an architecture for model inference, comparing online and batch serving for a production ML system.

InfrastructureTrade-offsModel ServingAmazon
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3
Machine Learning13 questions · ~136 min
Supervised vs Unsupervised LearningEasy
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Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffAmazon
Preprocessing Data With Missing ValuesMedium
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Explain how to preprocess missing data for a supervised learning task without introducing leakage or degrading model quality.

Cross-ValidationFeature EngineeringSupervised LearningAmazon
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4
Model Evaluation7 questions · ~73 min
Choosing Classification Evaluation MetricsEasy
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Explain which classification metrics to use and how metric choice depends on the business objective and error tradeoffs.

PrecisionAccuracyRecallAmazon
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5
Behavioral & Leadership3 questions · ~31 min
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6
More topics2 questions · ~21 min
Bias-Variance DiagnosisMedium
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Evaluates your ability to diagnose errors and guide next steps using bias-variance concepts.

Bias-Variance TradeoffRegressionVarianceAmazon
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