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Updated weekly · Last refresh Nov 11

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
CodingStart here. 3 questions · ~29 min
Two Sum Coding TaskEasy
Practice

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

Walmart Labs
Checked vs Unchecked ExceptionsEasy

Explain how Java's checked and unchecked exceptions differ in compiler treatment, typical causes, and API design use.

error handlingjavadatabase conceptsWalmart Labs
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2
Technical Fundamentals5 questions · ~48 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 · ~48 min
Using Spring Boot ReactivelyMedium

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

spring bootWalmart 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
Stream API FundamentalsMedium

Evaluates understanding of Java Stream API and practical usage patterns.

Walmart Labs

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Split String to RowsEasy
Practice
Practice drill

Split each input string into one ordered row per character while excluding NULL and empty inputs.

Data Manipulationdata validationdata extractionWalmart LabsWalmart
SQL Above Department AverageEasy
Practice
Recently asked
Practice drill

Identify Amazon employees earning above their department average using aggregation, a derived table, and joins.

ZZS AssociatesInc.Amazon
Read Queries and Max UserMedium
Practice
Practice drill

Find every user with the highest query count in audit.txt using PostgreSQL aggregation and joins.

JoinsAggregationsdata auditingWalmart Global TechWalmart Labs
The finish line: interview-readyComplete all 13 questions plus 3 hands-on drills to finish this plan.