DHH: Hey Leaves Rails for Rust

At Rails World 2026, Ruby on Rails creator David Heinemeier Hansson said 37signals is rebuilding Hey as six native apps with LLM-generated code and a Rust backend, not Rails. He reported writing 150,000 lines in August versus a 30,000-per-year pre-LLM average, with Ruby at just 3% of this year's output.