Stripe’s Developer Productivity team rolled out rubyfmt, a Rust-based zero-config Ruby autoformatter, across a 25 million line codebase in a single overnight run.
Key Takeaways
rubyfmt is Rust-based and zero-config, designed for speed at scale across the world’s largest known Ruby codebase.
Stripe extended rubyfmt internally before rolling it out, suggesting the upstream tool needed patches for edge cases at this scale.
The overnight rollout framing implies a single-batch atomic reformat rather than incremental per-PR adoption.
Developer Productivity teams at large monorepo shops face tooling, coordination, and diff-noise problems that a one-night blitz can sidestep.
