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Case Studies

Pick a product you use every day and follow one request through the whole system. Each case study covers the architecture, the trade-offs, what is confirmed versus inferred, and how to talk about it in a system design interview.

How a Chat AI Handles Your Message, End to End: Prompt Assembly, KV Cache and Streaming
AIOct 22, 202618 min read
How a Chat AI Handles Your Message, End to End: Prompt Assembly, KV Cache and Streaming
Follow one chat message from the input box to the GPU and back: how the server rebuilds the full prompt, why prefill and decode behave so differently, how the KV cache and prompt caching save work, and how tokens stream into a React UI.