Walmart Backend Engineer Interview Questions

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

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CodingStart here. 5 questions · ~60 min

Find the longest substring without repeated characters using a sliding window and last-seen index map.

Reverse a Linked List In PlaceEasy

Practice

Reverse a singly linked list in place using pointer manipulation in O(n) time and O(1) space.

RecursionLinked Listspointers

Walmart

Check Binary Tree BalanceEasy

Practice

Use postorder recursion to determine whether a binary tree is height-balanced in O(n) time.

RecursionSearchingTrees

Walmart

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Technical Fundamentals3 questions · ~36 min

Assesses your understanding of concurrency primitives and common failure modes.

Kafka Event-Driven BenefitsMedium

Tests your understanding of Kafka tradeoffs and how it supports event-driven systems.

kafkaarchitecture

Walmart

Spring Boot Startup OptimizationMedium

Evaluates your knowledge of Spring Boot internals and performance tuning for faster startup.

spring bootoptimization

Walmart

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Behavioral & Leadership4 questions · ~48 min

Balancing Technical Debt and DeadlineMedium

Tests prioritization under pressure, technical judgment, and stakeholder management when technical debt threatens a client deadline.

client deadlineConflict Resolutiontechnical debt

Walmart

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