Lantern Interviews

David Heinemeier Hansson on KDAV Radio

REWORK - What's the worst that could happen?

Host Jul 29, 2026 · 26 min

Skip this version: it duplicates appearance 266’s REWORK episode, with the same material and several identical quotes. The Breeze-to-HEY example is the most concrete takeaway if you have not heard the original.

Breeze, the example that Jason used here, required us to build a quite deep understanding of how email works and how we set these things up and DKIM rules. And all of that stuff eventually rolled forward into HEY. In fact, several of the infrastructure bits that we built for HEY came straight out of the Breeze lessons. So whatever time that was invested in that kind of trickled down through and got into it. And you know what? Even if it hadn’t, that would’ve been okay too. But most things that you do will have that effect.
from this episode

David Heinemeier Hansson discusses why 37signals favors fast, reversible experiments over prolonged analysis, emphasizing humility about predicting customer behavior. He also addresses criticism, the limited value of formal retrospectives, and how even products that do not succeed can contribute skills, infrastructure, and intuition to later work.