Hiroki Tomiyasu never planned to become a farmer. He didn’t inherit land or study agriculture, and spent his early career working as a public servant. But after joining a small group restoring abandoned rice terraces as part of an effort to revive aging farmland, he began teaching himself how to drive tractors, manage crops, and operate large-scale farmland.

Today he oversees about 100 hectares growing broccoli, pumpkins, green onions, and soy beans. But modern farming often requires expensive proprietary machines and specialized firms usually reserved for much larger operations. So he built what he needed himself with ChatGPT and Codex. Here’s some of what he’s built so far:

- A Codex-built system that automates the vents in his greenhouse - A field monitoring system that lays satellite data over his actual fields - Wiring diagrams for electric panels created from a photo - A connected farm management system that links work schedules, daily records, materials, and sensor data