Hi, I’m John. I love building things, particularly software, companies, and wooden objects.

Now

• Co-founder/CTO at Assembled
• 143.dev: open-source coding-agent infrastructure for teams. Here’s why we built it.
• Writing about AI, engineering, and startups.

Previously

• Co-founder and Chief Engineer at Zinc
• Early engineer at Stripe, employee ~100
• Contributor to Ruby on Rails, mostly ActiveRecord
• CS at MIT. My interesting projects are on the work page.