Derailing Our Application - How and Why We Are Decoupling Our Code from Rails

Explore how Cisco, one of the largest Rails shops with a 4 million line Ruby codebase under continuous development since 2007, has evolved their architecture to decouple 800,000 lines of Ruby code from Rails constructs in this 31-minute conference talk from RailsConf 2025. Learn from Fito von Zastrow and Alan Ridlehoover as they share their journey of scaling their development team to 1,000 engineers and beyond while maintaining the benefits of Rails. Discover the challenges faced with large codebases and the architectural decisions made to enable massive team scaling without sacrificing the advantages that Rails provides. Gain insights into decoupling strategies, code organization techniques, and the evolution of a major enterprise Rails application that has been in production for over 15 years.