Mark Koivuniemi

Now

Building ΔN1, a personal health system that learns what works for one body. Zone Pedal is shipped on the App Store for $29.99, a local trainer app for HR-guided steady rides and power-led intervals. Writing about AI-assisted engineering, the ways trust gets manufactured, and what it takes to ship in healthcare.

Essays

The Human in the Loop May 2026 The honest over-engineering story behind an HR-guided steady-ride trainer app. Training Through The Trough May 2026 The H10, WHOOP, and Garmin receipts behind Resistance Wearing a Lab Coat. Resistance Wearing a Lab Coat May 2026 Recovery scores can measure something real and still become borrowed doubt. The Convincer April 2026 What offshore contractors taught me about the confidence game AI is running. Ground Control to Major Mojo March 2026 Thirteen months, 4,000 commits, and a canary named Major Mojo. What AI coding tools actually look like in a production codebase.