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.” The rest of the author's notes on Software Engineer interview at Walmart, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.
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