DHH tells Rails World: "pencils down" on hand-written code

Posting a clip from his Rails World 2026 opening keynote, David Heinemeier Hansson wrote: "It's pencils down, people. Writing code by hand is no longer an economically viable skill for most programmers at most companies. But the future of making software has never been brighter. Don't you dare black pill this beautiful moment!" The post has drawn 7,300 likes and 2.1 million views as of this morning, up from 6,600 likes and 1.8 million views the previous evening.

According to a summary of the keynote published by Dealroom, 37signals now treats agent-generated code as the normal course of business and hand-writing as the exception, reserved for fixing the agent when it misfires. Hansson said he wrote roughly half as much code by hand over the past 20 months as in the 21 years before that, including 150,000 lines in August alone against a long-run average near 30,000 lines a year. Hey, the company's email product, is being rebuilt as six agent-written native applications with its mail server core rewritten in Rust. An early attempt to let designers vibe-code the final features of Basecamp 5 reportedly left the architecture "like Swiss cheese," but the agent-accelerated release has since shipped. Hansson's practical demand for other developers, per the same summary: "If your app doesn't have a CLI, I want to see it by next Friday," on the argument that a command-line interface is what lets an agent act on an application the way a person would.

Why it matters: Hansson is not a fringe voice making this claim. A well-known, widely-followed practitioner publicly declaring hand-written code obsolete at his own company, with a specific and checkable practice attached (give your app a CLI), is a different kind of evidence than the same argument made by a commentator. Whether "most programmers at most companies" is true is a separate question from whether it changes what people expect a serious engineering organization to look like this year.