SOFTWARE ENGINEER · AUTHOR

Dongsun Moon

I write about software architecture,
AI, and building systems that work
in the real world.

From distributed systems to production AI,
I explore the practical decisions that turn complex
ideas into reliable products.

NEW BOOK

Beyond the Model

A Systems Theory of Modern AI Quality

Your model got better. Your product did not. A diagnostic method for teams already shipping AI: before you ask which model, ask which layer.

CORE IDEAS

Named ideas, each with a definition page you can link to and cite.

Where production AI quality is won or lost: the model and the six surfaces around it.

The fraction of teams that must deploy together for one change to reach production.

An expiry date on every architectural decision, so it is re-examined instead of renewed by default.

Consistency set per domain, key, and scene, instead of one label for the whole system.

Notes on software architecture, production AI, and engineering.