James Sorley Jackson focused on enhancing UI consistency and theming stability within the Signal-iOS repository during December 2025. He addressed a critical bug in the Share Extension, ensuring that theme updates responded accurately to system appearance changes such as light and dark mode. Using Swift and applying UI/UX design principles, James improved visual coherence and accessibility across both the main app and its share flow. His work involved integrating iOS extension best practices and thorough testing to prevent theming drift. While the period included no new features, the targeted bug fix demonstrated depth in iOS development and attention to user experience.