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Updated weekly · Last refresh Aug 30

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 weekly.

32questions
~5htotal time
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1
CodingStart here. 4 questions · ~38 min
Merge Two Sorted ArraysEasy
Practice

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

ArraysSortingTwo PointersAmazon Services
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersAmazon Services
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2
Machine Learning7 questions · ~67 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffAmazon Services
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3
NLP3 questions · ~29 min
Transformer LLM Pretraining vs Fine-TuningHard

Tests knowledge of transformer internals and the distinctions between pretraining and adaptation.

Neural NetworksLanguage ModelsDeep LearningAmazon Services
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4
Behavioral & Leadership12 questions · ~115 min
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5
More topics6 questions · ~57 min
7-Day Rolling Active UsersMedium
Practice

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

Window FunctionsDate FunctionsRunning TotalsAmazon Services
Model Performance EvaluationEasy

Tests your ability to select metrics, validation strategy, and interpret results for ML models.

PrecisionAccuracyRecallAmazon Services
Design a Personalized Product RecommenderHard

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
Design an A/B Test for RankingMedium

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
Practice drill

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

Window FunctionsDate FunctionsAggregationsCurefitReachMobiIndeed
SQL for Missed ProductivityHard
Practice
Practice drill

Use joins, aggregation, and CASE expressions to find Amazon Services shifts missing hourly productivity thresholds over 30 days.

sql queryData AnalysisAmazon Services
The finish line: interview-readyComplete all 32 questions plus 2 hands-on drills to finish this plan.