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Long-form notes on LLM architecture, systems thinking, and engineering decisions in real-world AI products.

  • Apr 3, 2026

    Prompt Caching from First Principles

    Why you are paying too much for tokens, how caching actually works, and the math that makes it obvious.

  • Mar 6, 2026

    The Loss Function That Writes Back

    Coding agents, harness design, and a daily practice for getting less wrong.

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