Just did the Walmart Global Tech OA and wanted to write this up while everything is fresh because the format details are hard to find.
Format. Two coding problems on HackerRank, 90 minutes total. You can use any language. I used Python. There's a test-case runner so you can see some pass/fail before submitting, not all of them.
Difficulty. Both questions were what I'd call Leetcode medium, leaning easy-medium. Not hard. One was a modified BFS problem (shortest path variant, specific constraints that make brute force fail). The other was a string manipulation / sliding window thing. Neither required DP or graphs beyond basic BFS.
I've seen posts saying Walmart OA is easy compared to Google or Meta, and that tracks with my experience. That said, you can't just throw O(n^2) solutions at them. The test cases do probe efficiency.
What I wish I knew. The HackerRank environment is a little clunky, especially if you're used to LeetCode. Practice at least a few problems on HackerRank itself before the real thing just so you're not fighting the editor. Also, the timer includes reading time, there's no separate reading phase.
Time to hear back on OA results: about 10 days for me. No automated pass/fail email, my recruiter just reached out with next steps (a 30-minute phone screen with a technical lead).
Context on the role. This was for a mid-level SWE position on the supply chain tech side in Hoboken, NJ. I've heard the OA might be slightly different for the Sunnyvale or Bentonville offices but can't confirm.
Happy to answer questions if anyone's in the same pipeline right now.