Francisco stabilized core UI components in the Telefonica/mistica-ios repository by addressing race conditions affecting Button and BottomSheet interactions during the Xcode 26 Beta 1 cycle. He applied concurrency-safe updates using Swift and SwiftUI, leveraging MainActor and Task blocks to ensure UI changes executed on the main thread. This approach mitigated UI glitches and improved the reliability of critical user interactions, directly supporting product quality goals. By resolving compilation issues and adapting to the evolving beta toolchain, Francisco demonstrated depth in concurrency management and iOS development, delivering maintainable solutions that enhance forward-compatibility and user experience within the project’s core components.