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Amazon Lab126 Interview Questions

The questions to prepare for Amazon Lab126 interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 6 questions · ~62 min
Linked List ReversalEasy
Practice
Recently asked

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysAmazon Lab126
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2
Execution6 questions · ~62 min
Manage Technical Debt DeliberatelyMedium

Explain how you would prioritize and execute technical debt work without losing stakeholder alignment or delivery momentum.

Trade-offsRisk AssessmentScope ManagementAmazon Lab126
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3
Machine Learning5 questions · ~52 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 Lab126
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4
Metrics4 questions · ~41 min
Define Success Metrics for FeaturesMedium

Set a clear north star, supporting KPIs, leading indicators, and guardrails for a new product feature.

North Star MetricLagging IndicatorsKPIsAmazon Lab126
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5
Product Sense5 questions · ~52 min
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueAmazon Lab126
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6
System Design5 questions · ~52 min
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7
More topics19 questions · ~197 min
Window Functions for Top UsersMedium
Practice

Use aggregation and ROW_NUMBER to find the top three Lexis+ users by total session duration within each region.

Window FunctionsData AnalysissqlAmazon Lab126
Tell Me About YourselfEasy

Craft a concise self-introduction that highlights fit, communication style, and relevance for an Account Executive role.

brand cultureBusiness AcumenCompetitive AnalysisAmazon Lab126
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchAmazon Lab126
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Database Trade-Offs for DetectionHard
Practice
Practice drill

Compare financial crime detection architectures using joined run metrics, aggregates, NULL handling, and ordered performance results.

fraud detectionTrade-offsdistributed databasesDeloitte
Database Indexing Trade-offsHard
Practice
Practice drill

Compare PostgreSQL index strategies by read latency, write overhead, storage size, and an overall cost score.

Trade-offsdatabase optimizationdatabase managementHHostinger InternationalPPorch GroupCapital Technology Group
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.