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Notes on systems, security, building products, and everything in between.

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Builder Jun 27, 2026

How to run two Claude Code accounts in parallel on the same machine

Got a personal account and a work one in Claude Code? With CLAUDE_CONFIG_DIR and direnv you can keep both active at once without ever logging out. A 3-minute setup.

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Spec Driven Development: stop asking AI for code and start giving it intent

Prompt Driven Development is broken. Most devs ask AI for technical things and then act surprised when the result doesn't fit. SDD flips the equation: you define the behavior, AI implements.

I bought a NAS. And this is why.

Why I decided to buy a NAS: stop depending on the cloud, take back control of my data, real backups for three devices, RAID1 with IronWolf and Backblaze B2 as an offsite layer.

The Vercel hack: how it happened and why it should worry you

An employee connected an AI tool to their corporate account. Months later, that connection was the entry vector. This is not a Vercel problem. It is everyone's problem.

How I automated my finances using Notion and Google AI

How I built an automated financial management system with Notion, Python and Google Gemini to classify thousands of bank transactions without manual effort.

From the geopolitical board to the ad on your smartphone: how your data becomes useful intelligence for governments and corporations

OPSEC (Operational Security): what it is, where it comes from and why operational security is as relevant today as it was during the Vietnam War.