This session explores the transformation of large-scale enterprise iOS apps using reactive architecture. Drawing from Rutul Desai’s experience modernizing Capital One’s mobile platform, we’ll dive into real-world strategies for improving performance, reliability, and maintainability through modern design patterns, analytics, and automated testing. Key Takeaways: • How to refactor legacy mobile apps using reactive architecture • Practical insights into implementing analytics and observability at scale • Strategies for integrating automated testing for enterprise-grade apps • Lessons from leading engineering efforts in highly regulated industries