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The New System Design Question in 2026 Interviews: Design an LLM Chat Service

This story is from 2026-10-05. It is preserved in the archive; the latest stories are on the live feed.

"Design a URL shortener" isn't going away. But a new question keeps showing up in system design loops: design a ChatGPT-style chat service. It looks like a chat app. It isn't. A normal chat app moves small messages between people. An LLM chat service runs an expensive computation for every message,…

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  1. 2026-10-05 00:50 · DEV Community — AI
    The New System Design Question in 2026 Interviews: Design an LLM Chat Service

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