Several years ago, after some initial explorations SoFi undertook the work to migrate from doing native development on Android and iOS to doing cross-platform development with Flutter. Since then our products, our customer base, and our team have grown tremendously. We’ll cover the technical and operational benefits we’ve seen from using Flutter as well as challenges and lessons learned along the way. The summary of the talk's content includes: - Cross-Platform Excellence: Flutter enables true cross-platform development with minimal duplication of work, allowing simultaneous feature launches on iOS and Android. The presentation will discuss how SoFi's monorepo is now 98.6% Dart, reducing the need for native code, and will cover internal tools like somo and the design system catalog app for approachable macOS development. - Reliability and Efficiency: SoFi experiences high reliability with a stable crash rate (over 99.95% crash-free sessions). Development cycles are tight due to hot code reloading and fast build times. - Customization and Interoperability: The talk will delve into the deep customization achieved through design system work, including the decision to move away from Material, and the ability to look at underlying source code. Other topics include easy learning and leveraging native SDKs via native interop.