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Walmart interview notes, page 11 of 14

Large Enterprises

Most of these Walmart write-ups come from Software Engineers (91), then Product Managers (21) and Data Scientists (13). The most reported rounds are the technical phone screen (47), the hiring manager screen (23), the product sense round (16) and the system design round (13).

139 interview notes · updated Oct 2026

Walmart·Mobile Engineer·Technical Phone Screen

Jun 2026
Did a coding round for a mobile engineer role at Walmart Labs. Pretty straightforward problem on the surface but the aggregation part tripped me up a bit.
  • Given a list of structs each containing a type, an id, and a num field, return a mapping from type to the sum of all num values and a list of (id, num) pairs sorted by num.

“Took me a minute to even figure out what data structure to return.”

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Walmart·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Walmart Labs for a software engineer role. The whole thing was centered on one big problem about temperature sensors and it went deeper than I expected, covering a lot of ground across storage, streaming, and spatial stuff.
  • Design a system that ingests data from a statewide network of temperature sensors (one per N square feet) and supports three use cases: fetching the latest reading for a specific sensor, returning the top-K hottest sensors globally right now, and rendering a statewide heat map.

“This was the entire interview basically.”

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Walmart·Software Engineer·Onsite - Coding / Algorithms

Jun 2026
Did the first half of an onsite with two back-to-back 60-minute coding rounds, four questions total. Got through three cleanly but ran out of time on the last one and I'm genuinely not sure how they'll score it.
  • Three coding problems solved with optimal time and space complexity during the onsite session.
  • A medium-to-hard implementation-heavy problem requiring a min-heap combined with a queue.

“Knocked these out and did dry runs for each, which I think helped show I wasn't just pattern-matching.”

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Walmart·Software Engineer·Online Assessment (OA)

Jul 2026
Took the Walmart online assessment for a senior data scientist role, 75 minutes total split between SQL and a data science section. The SQL part had an AI helper built in which was a nice surprise; the DS section did not, so you're on your own there.
  • Solve an intermediate-level SQL problem (an AI syntax/explanation helper is available during this section).
  • Given a structured dataset similar to a classic ML benchmark, perform exploratory data analysis, preprocess the data, engineer features, and fit a model. No AI assistance is provided for this section.

“The AI helper is there but I'd be careful leaning on it too hard.”

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Walmart·Data Scientist·Online Assessment (OA)

Jul 2026
Online assessment for a Data Scientist role, heavy on PostgreSQL window functions and statistical aggregations. Four SQL tasks back to back, each one a bit more painful than the last.
  • Given a multi-section online assessment schema (candidates, submissions, questions, responses), write a query to compute per-subtype accuracy and median response time for each attempt, filtering to attempts with at least 15 verbal responses. Also return total verbal response count and total time per attempt.
  • Flag 'rushing' attempts where more than 20% of verbal responses have a response time under 15 seconds. Return attempt_id, candidate_id, and the rushing rate.
  • Within the verbal section, find the subtype with the strongest absolute Pearson correlation between response time and correctness. Return subtype, correlation value, and sample size n. Use PostgreSQL's built-in corr() function.
  • For each candidate, compute verbal questions per minute and correct answers per minute from their most recent attempt only. Then rank candidates within their location by correct per minute, breaking ties using lower average time per question.

“The median part is what got me.”

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Walmart·Data Scientist·Hiring Manager Screen

Jul 2026
Casual hiring manager chat for a Data Scientist role at Walmart Labs, mostly focused on getting a read on who you are as a person rather than anything technical.
  • What is the biggest setback you have experienced in your life and how did you overcome it?
  • Which high school did you attend?

“I went with a professional story but it felt a bit sanitized in hindsight.”

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Walmart·Software Engineer·Hiring Manager Screen

Jul 2026
Fumbled a basic management question and now I'm spiraling about whether to email the recruiter to fix it.
  • How many people do you directly supervise?

“I gave some roundabout answer about my broader team instead of just saying the number.”

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Walmart·Software Engineer·Technical Phone Screen

Jul 2026
Walmart Labs SWE interview, coding round. Two-sum with a twist on tie-breaking, plus a verbal follow-up on the three-sum problem. Nothing too wild but the details in the first question tripped me up more than I expected.
  • Given an unsorted integer array and a target value, return the indices of the two elements that sum to the target. If multiple valid pairs exist, return the one with the smallest first index, and break further ties by the smallest second index.
  • Walk through an efficient approach to finding all triplets in an array that sum to zero, ignoring duplicate triplets.

“I jumped straight to the hashmap approach and coded it up fast, but then they asked about the tie-breaking rules and I realized my solution just returned the first pair it found, which isn't guaranteed to have the smallest i.”

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Walmart·Data Analyst·Onsite - Cross-functional / Panel

Jul 2026
Product Team round at Walmart Labs for a Data Analyst role. No case study, which I wasn't expecting. It was mostly behavioral and a lot of back-and-forth about how you work with product people, which honestly felt more like a culture fit conversation than a technical screen.
  • Walk me through an analytics project that you think is representative of your work.
  • How do you typically collaborate with product managers on a project?
  • Tell me about a time you had to manage a difficult stakeholder.
  • How do you decide what to work on when everything is marked high priority?
  • What draws you to Last Mile logistics and marketplace analytics specifically?
  • What's a product or feature you've been using recently that you find interesting?

“I picked a project I'd told a dozen times before and still fumbled the middle of it.”

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Walmart·Software Engineer·Onsite - Behavioral / Leadership

Jul 2026
Walmart Labs senior engineer loop, focused entirely on leadership behavioral questions. Two meaty prompts about conflict and team motivation, no coding or system design.
  • Tell me about a serious conflict you had to manage on your team. Walk through what it was about, how you found out, what you did, and what happened.
  • What do you actually do to keep your team motivated when things get rough, like during a bad incident or a long refactor? Give specific examples.

“I had a decent story ready about two engineers going back and forth over service ownership during a platform migration.”

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