2026

From Rails 3.0 to Rails Edge: 15 years of upgrades in a 3 million line monolith

Intercom has been running on Rails since 2011. Starting from Rails 3.0, today our 3 million line monolith is running on the main branch of Rails. This talk covers our Rails upgrade journey over the last 15 years - the things that broke, the monkey patches keeping it all together, and what it takes to get 300 engineers comfortable shipping on unreleased Rails versions.