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Updated weekly · Last refresh Oct 17

Amazon Services Applied Scientist Interview Questions

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

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1
CodingStart here. 4 questions · ~38 min
Merge Two Sorted ArraysEasy
Practice
Recently asked

Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo PointersAmazon Services
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2
Machine Learning7 questions · ~67 min
Bias-Variance Tradeoff in Model SelectionEasy
Recently asked

Explain how bias and variance shape model complexity, generalization, and model selection.

Cross-ValidationBias-Variance TradeoffRegularizationAmazon Services
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3
NLP3 questions · ~29 min
Self-Attention in TransformersMedium
Recently asked

Tests your understanding of how Transformers compute token-to-token relationships.

transformersDeep LearningAmazon Services
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4
Behavioral & Leadership11 questions · ~105 min
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5
More topics7 questions · ~67 min
Model Performance EvaluationHard
Recently asked

Explain how to select metrics, validate predictions, and analyze errors when evaluating a machine learning model.

model performanceevaluation metricsPrecisionAmazon Services
7-Day Rolling Active UsersMedium
Practice
Recently asked

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsAmazon Services
Design a Personalized Product RecommenderHard
Recently asked

Design an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.

Feature StoreFeature DriftModel ServingAmazon Services
Build a Data Pipeline ArchitectureMedium
Recently asked

Tests data pipeline design choices, reliability, and end-to-end data flow thinking.

Stakeholder ManagementCommunicationOwnershipAmazon Services
Design an A/B Test for RankingMedium
Recently asked

Tests experimental design, metrics, and statistical reasoning for ranking improvements.

Hypothesis TestingStatistical SignificanceA/B TestingAmazon Services
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Calculate 30-Day User RetentionHard
Practice
Recently asked
Practice drill

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsCurefitIndeedTikTok
SQL Plan Upgrade DetectionMedium
Practice
Practice drill

Identify customers with at least two plan upgrades in the same calendar month using PostgreSQL CTEs and aggregations.

Window FunctionsDate FunctionsJoinsMongoDBAmazon Services
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