Notes on design, engineering, and growth.
Practical writing on building and scaling software products — how we think, and how we work.
June 29, 20265 min read
The most important part of an AI assistant is what it refuses to do
Everyone is racing to let AI handle more. In a real business — money, contracts, regulated processes — the value is in what you forbid it to do. Notes on building an AI layer you can actually trust.
Read article →June 28, 20266 min read
Most HVAC software still sizes ducts wrong. Here's what right looks like.
A 5-inch duct for 110 CFM isn't a typo — it's what velocity-only sizing produces. Why rule-of-thumb duct sizing keeps failing, and what proper ACCA Manual J and Manual D actually take.
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