Writing

What I'm learning running three internet companies with AI: what shipped, what broke, and what I'd do differently.

Occasional emails from me, only when there's something worth sending. Unsubscribe anytime.

operating specimen

A successful checkout must result in the access and terms the buyer was promised.

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External resources

cass: historical Decision Note

Read the historical cass evaluation decision, with links to its evidence and current-revision index.

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FailureClass: simulated worked diagnosis

Explore a simulated failure diagnosis using teaching fixtures. The repository README includes runnable instructions.

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November 5, 2026

Codex vs Claude Code: which to pick, and how I run both

Claude Code vs Codex from someone who runs both on one machine: what each costs, what each is for, and how I split the work between them.

August 4, 2026

Footnote 353

In 2017 a Yale law student needed proof that Amazon was tying its warehouse service to search placement. The citable source was a blog post. She later became chair of the FTC.

January 20, 2026

Why I Build in Public

The strategic advantage of sharing your journey as an entrepreneur, and why transparency beats secrecy.