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Walmart Senior Software Engineer Interview Experience

Senior Software Engineer

Walmart
August 12, 2026
36 Questions
Selected

Summary

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The interview process at Walmart consisted of five comprehensive technical rounds covering a broad range of topics. Across the rounds, the candidate was evaluated on Core Java & Concurrency, Spring Boot internal mechanics, Microservices architecture and DevOps practices, SQL queries and indexing, and Low-Level System Design (LLD). Overall, the process was thorough with a medium-to-hard difficulty level, heavily focusing on deep technical understanding, concurrency, and SOLID principles.

1

Round 1 (Core Java & Concurrency)

#1

Internal differences between HashMap and ConcurrentHashMap

What are the internal differences between HashMap and ConcurrentHashMap?
Java
Concurrency
ConcurrentHashMap
HashMap
Medium
#2

JVM Memory Model architecture

Explain the JVM Memory Model, including Heap, Stack, and Metaspace.
Java
Memory Management
JVM
Medium
#3

Atomic variables and use cases

What are Atomic variables, and in which scenarios are they commonly used?
Java
Concurrency
Atomic Variables
Medium
#4

Volatile vs Synchronized

What is the difference between volatile and synchronized?
Multithreading
Java
Concurrency
Medium
#5

Minimizing synchronization bottlenecks

How can synchronization-related performance bottlenecks be minimized?
Java
Performance
Concurrency
Medium
#6

ThreadLocal and memory leaks

What is ThreadLocal, and how can it lead to memory leaks?
Java
Memory Leaks
ThreadLocal
Medium
#7

BlockingQueue usage in production

What is a BlockingQueue, and where is it used in production systems?
Java
Concurrency
BlockingQueue
Medium
2

Round 2 (Spring Boot)

#1

Internal working of @SpringBootApplication

What does @SpringBootApplication do internally?
Java
Spring Boot
Annotations
Medium
#2

How @EnableAutoConfiguration works

How does @EnableAutoConfiguration work behind the scenes?
Spring Boot
Auto-configuration
Medium
#3

Constructor-based vs Field-based @Autowired injection

What is the difference between constructor-based and field-based @Autowired injection?
Spring Boot
Dependency Injection
Easy
#4

Purpose and execution of @PostConstruct

What is the purpose of @PostConstruct, and when is it executed?
Java
Lifecycle
Spring Boot
Easy
#5

Internal working of Dependency Injection

How does Dependency Injection work internally in Spring Boot?
Spring Boot
Dependency Injection
Inversion of Control
Medium
#6

Differences between @Component, @Service, and @Repository

What is the difference between @Component, @Service, and @Repository?
Spring Boot
Annotations
Easy
#7

Global exception handling in Spring Boot

How do you implement global exception handling in Spring Boot?
Spring Boot
Exception Handling
Medium
3

Round 3 (Microservices & DevOps)

#1

Microservices vs Monolithic architecture choice

Why did you choose a microservices architecture instead of a monolithic architecture?
Architecture
System Design
Microservices
Medium
#2

Kafka vs RabbitMQ trade-offs

What are the key differences between Kafka and RabbitMQ, and when would you choose each?
Kafka
RabbitMQ
Messaging Queues
Medium
#3

SQL vs NoSQL trade-offs

SQL vs NoSQL: What are the differences, and when should each be used?
Databases
SQL
NoSQL
Medium
#4

CI/CD Pipeline and Jenkins walkthrough

Explain your CI/CD pipeline. Walk through your Jenkins build process.
Jenkins
CI/CD
DevOps
Medium
#5

Istio and Service Mesh features in Kubernetes

What are the key features of Istio and Service Mesh in Kubernetes?
Kubernetes
Istio
Service Mesh
Medium
#6

Dockerizing a Spring Boot application

How do you Dockerize a Spring Boot application?
Docker
Spring Boot
DevOps
Easy
#7

Managing distributed transactions in Microservices

How do you manage distributed transactions across microservices?
Microservices
Transactions
Distributed Systems
Hard
4

Round 4 (SQL & Database)

#1

SQL Query with GROUP BY and HAVING

Write a query using GROUP BY and HAVING.
Database
SQL
Easy
#2

UNION vs UNION ALL in SQL

What is the difference between UNION and UNION ALL?
Database
SQL
Easy
#3

LEFT JOIN vs RIGHT JOIN in SQL

What is the difference between LEFT JOIN and RIGHT JOIN?
SQL
Joins
Easy
#4

Retrieve second-highest salary

How do you retrieve the second-highest salary from a table?
Database
SQL
Medium
#5

Eliminate duplicate records in SQL

How do you eliminate duplicate records in SQL?
Database
SQL
Medium
#6

Handling NULL values and conditional logic

How do you handle NULL values and conditional logic in SQL?
Database
SQL
Easy
#7

Clustered vs Non-clustered Indexes

What is the difference between clustered and non-clustered indexes?
SQL
Database Indexing
Medium
5

Round 5 (Low Level Design)

#1

Design a ConcurrentHashMap from scratch

Design a ConcurrentHashMap from scratch.
Java
Concurrency
Low Level Design
Hard
#2

Design a Restaurant Reservation System

Design a Restaurant Reservation System.
Object-Oriented Design
Low Level Design
Medium
#3

Design a Parking Lot System

Design a Parking Lot System.
Object-Oriented Design
Low Level Design
Medium
#4

Design a Rate Limiter

Design a Rate Limiter (class design, interfaces, methods, and design patterns).
Design Patterns
Low Level Design
Medium
#5

Applying SOLID principles in Object-Oriented Design

Apply SOLID principles — the interviewer may challenge every design decision.
Low Level Design
SOLID Principles
Hard
#6

Thread safety and immutability in system design

Ensure thread safety and immutability in your design.
Thread Safety
Immutability
Low Level Design
Medium
#7

Deep cloning vs Shallow cloning

Explain deep cloning vs shallow cloning, and when each is applicable.
Java
Cloning
Easy
#8

Design a Vending Machine

Design a Vending Machine.
Object-Oriented Design
Low Level Design
Medium
ConcurrencyMicroservicesSpring BootSQLCore JavaLow Level Design
A

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