David Heinemeier Hansson Outlines Vision for LLM-Driven Development at Rails World 2026

DHH's New Development Philosophy

David Heinemeier Hansson (DHH), creator of Ruby on Rails, delivered the opening keynote at Rails World 2026, outlining a new vision for software development. He announced his retirement from professional programming, now identifying as a 'maker.' His new philosophy centers on the extensive use of Large Language Models (LLMs) for code generation, suggesting that English is the optimal programming language due to LLM capabilities.

Shift to LLM-Generated Code and Rust

DHH stated that writing code by hand is no longer economically productive for most programmers. He has changed his stance on native applications and the Rust programming language, which he previously criticized. For the next version of Hey, 37signals is using LLMs to build native applications across all supported platforms. The server-side development for Hey will utilize Rust, which DHH considers suitable for LLM generation despite its complexity for human developers.

Reduced Ruby Usage and Future Outlook

DHH reported a significant increase in his personal code output, attributing it to LLMs, with 150,000 lines written in August compared to an annual average of 30,000 lines previously. His Ruby code output, which once constituted half of his work, now accounts for only 3%. He predicts that human code reading will become an exception, not the norm, across the industry by the end of the year. DHH also expressed a desire for all services to offer a Command Line Interface (CLI) for agent-based interaction.