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Updated weekly · Last refresh Sep 24

Walmart Labs Backend Engineer Interview Questions

The questions to prepare for a Walmart Labs Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~51 min
Checked vs Unchecked ExceptionsEasy
Practice

Compare checked and unchecked Java exceptions by retrieving their compile-time handling requirements and representative examples.

error handlingjavadatabase conceptsWalmart Labs
Using Spring Boot ReactivelyMedium

Assesses ability to build reactive backend services with Spring Boot and relevant concepts.

spring bootWalmart Labs
Top Underperforming Regions by ConversionMedium
Practice
Practice drill

Task Walmart Labs Operations uses regional funnel metrics to monitor performance across its commerce network. Write a PostgreSQL query that identifies the ...

Conversion Ratesql queryData AnalysisWalmart Labs
Running Sales Totals by RegionEasy
Practice
Recently asked
Practice drill

Calculate daily and cumulative Walmart Marketplace sales by region for a rolling 30-day reporting period.

Walmart Labs
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2
Technical Fundamentals5 questions · ~52 min
Spring Boot Core ComponentsMedium

Evaluates your understanding of Spring Boot architecture and dependency injection.

dependency injectionspring bootFrameworksWalmart Labs
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3
More topics5 questions · ~52 min
Two Sum Coding TaskEasy
Practice

Find two indices whose values sum to a target using a hash map in linear time.

Walmart Labs
Debugging Spring Performance BottlenecksMedium

Evaluates your troubleshooting workflow for identifying and fixing performance issues in production.

DebuggingWalmart Labs
Microservices Transaction ManagementMedium

Assesses your approach to maintaining data consistency across microservices transactions.

architecturemicroservicesWalmart Labs
Concurrency in Multi-ThreadingHard

Tests ability to prevent race conditions, manage synchronization, and reason about thread safety.

system designconcurrencyWalmart Labs
Time Complexity of Sorting AlgorithmsEasy

Compare common sorting algorithms by best, average, and worst-case time complexity and explain when each is appropriate.

MathArraysSortingWalmart Labs

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The finish line: interview-readyComplete all 13 questions plus 2 hands-on drills to finish this plan.