OfferLoop
Sign inOpen app

INTERVIEW GUIDE

Walmart Software Engineer Interview: Questions & Process

Walmart Global Tech's software engineer interview is a solid, standard tech loop: a HackerRank-style online assessment, a coding phone screen, then an onsite of data-structure-and-algorithm coding, system design (heavier for higher levels), and a values-based behavioral round. The bar is real but more approachable than top FAANG — clean medium-difficulty problem solving and good communication carry you far.

The interview process

1. Online assessment — HackerRank, ~60-90 min
Tests: two or three coding problems (arrays, strings, hash maps) plus occasional multiple-choice CS fundamentals
2. Recruiter screen — ~30 min call
Tests: background, role and level fit, location/relocation, and timeline
3. Technical phone screen — 45-60 min live coding
Tests: one or two DSA problems solved in a shared editor while you explain your approach
4. Onsite coding rounds — 1-2 interviews, 45-60 min each
Tests: medium DSA — arrays, hashing, trees, intervals — plus follow-ups on complexity and clean code
5. System design / hiring manager + behavioral — 45-60 min
Tests: for new grads, lighter design and lots of behavioral; values like 'Respect for the Individual' and ownership

Questions you're likely to get

Technical

  • Given an array of numbers, return the indices of the two that sum to a target.
  • Find the contiguous subarray with the largest sum.
  • Merge a set of overlapping intervals.
  • Count the number of connected islands in a 2D grid.
  • Merge two sorted linked lists into one sorted list.
  • Design an LRU cache with O(1) operations.

Role-specific

  • How would you design a service that handles inventory counts across thousands of stores?
  • What's your approach to handling traffic spikes, like a Black Friday surge?
  • Walk me through how you'd debug a slow API endpoint in production.

Behavioral

  • Tell me about a time you took ownership of a project from start to finish.
  • Describe a disagreement with a teammate and how you resolved it respectfully.
  • Tell me about a time you had to learn a new technology quickly to deliver.
  • Why Walmart Global Tech, and what do you want to work on here?

Practice these problems live

Relevant LeetCode problems for the Walmart Software Engineer loop. Start a live, AI-run coding interview on any of them — or open the problem on LeetCode.

▶ Two Sum· Easy · LeetCode #1
Two Sum is the canonical hashing warmup and a frequent OA opener.
▶ Maximum Subarray· Medium · LeetCode #53
Maximum Subarray tests whether you reach for Kadane's instead of brute force.
▶ Merge Intervals· Medium · LeetCode #56
Merge Intervals checks sorting plus a clean single-pass sweep — common at Walmart.
▶ Number of Islands· Medium · LeetCode #200
Number of Islands covers the BFS/DFS grid pattern they like to ask.
▶ Merge Two Sorted Lists· Easy · LeetCode #21
Merge Two Sorted Lists verifies careful linked-list pointer handling.
▶ LRU Cache· Medium · LeetCode #146
LRU Cache is the go-to design-flavored medium for stronger candidates.

How to answer (worked examples)

Merge a set of overlapping intervals.
State the plan before coding: sort intervals by start time, then sweep once, merging the current interval into the last result interval whenever they overlap. Call out edge cases — empty input, single interval, touching-but-not-overlapping endpoints. Code it cleanly, dry-run one example out loud, and finish with O(n log n) for the sort. Walmart values readable, correct code over clever tricks.
Tell me about a time you took ownership of a project end to end.
STAR. Situation: the project and why ownership was unclear. Task: what you committed to. Action: concrete decisions you drove, including a tradeoff you'd defend and how you kept stakeholders informed. Result: a measurable outcome. Tie it to Walmart's emphasis on ownership and delivering for the customer.

What Walmart looks for

FAQ

How hard is the Walmart SWE interview?

Moderate. Expect mostly medium LeetCode-style problems rather than the hardest puzzles. Strong fundamentals, clean code, and clear communication matter more than exotic algorithms. The online assessment is the most common filter, so practice timed HackerRank problems.

What's on the online assessment?

Typically two or three coding problems on HackerRank covering arrays, strings, and hash maps, sometimes with multiple-choice CS questions. Manage your time and make sure your code passes the provided test cases.

Is there a system design round for new grads?

It's lighter for new grads — you may get a simplified design discussion or none at all, with more weight on coding and behavioral. For experienced roles, expect a full system design round.

What tech stack does Walmart Global Tech use?

A lot of Java and Spring on the backend, plus React, Node, and cloud-native infrastructure. You can usually interview in the language you're strongest in, but familiarity with the JVM ecosystem helps.

How long does the process take?

Usually a few weeks from assessment to decision, though it varies by team and time of year.

Get reps before the Walmart loop

The hard part isn't knowing the algorithm — it's explaining it cleanly while you code under a timer, then switching to a sharp ownership story. Practice the exact Walmart rounds with OfferLoop's realtime voice coach so it feels routine on the day.

Practice this interview out loud →

Related

All Walmart interviews →Walmart Data Analyst interview →Walmart Data Scientist interview →Walmart Data Engineer interview →Walmart Machine Learning Engineer interview →

OfferLoop is an independent interview-practice tool and is not affiliated with, endorsed by, or sponsored by Walmart. All company names and trademarks are the property of their respective owners.

Interview formats vary by team, level and year, and this guide is compiled from general knowledge of publicly discussed hiring processes — treat it as preparation material, not an official description of Walmart's current process.