Jeff McCracken
P.E. — Engineer. Builder. Explorer.
21 years deploying smart grid infrastructure at scale. Now building Sabrina — a Personal Operating System that manages my consulting practice, my investments, and increasingly, itself.
P.E. — Engineer. Builder. Explorer.
21 years deploying smart grid infrastructure at scale. Now building Sabrina — a Personal Operating System that manages my consulting practice, my investments, and increasingly, itself.
Watch
A walkthrough of the system — from voice input to task execution to self-building code.
What She Does
Not a Second Brain that stores knowledge. A full-stack system that takes action.
Every day at 5 AM, Sabrina synthesizes email, calendar, and priorities into a briefing — before I'm awake.
The Kai history system captures every session, decision, and learning in structured markdown that survives crashes and persists across sessions.
Parallel agents execute work orders overnight — writing code, running tests, building features. I review the commits in the morning.
Speak to the Mac menu bar. Sabrina processes intent, routes to the right system, and creates tasks in Motion. Delegation math: flipped.
Sabrina writes her own features. The git log shows overnight commits where she extended her own capabilities — tested and deployed.
The same Chief of Staff that manages my calendar is progressively wiring herself into an Automated Trading System with 40+ PostgreSQL tables.
Architecture
Voice, intelligence, action, and memory — connected.
"The best architecture is the one that disappears. The one that doesn't require maintenance. The one that works with tools you already have rather than replacing them."
— The Story of SabrinaMarch 14, 2026 · San Francisco
The public debut. 45 minutes. Four live demos. The architecture decisions that mattered, the two systems I threw away, and the patterns that actually work.
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