Joseph focused on enhancing the reliability and maintainability of face landmark overlay rendering in the google-ai-edge/mediapipe-samples repository. He improved the OverlayView component by refining scaling and centering logic, ensuring accurate and robust display of face landmarks. Using Kotlin and leveraging his skills in Android development, computer vision, and graphics rendering, Joseph introduced helper utilities for drawing landmarks and connectors, which streamlined the codebase for future enhancements. He also addressed edge cases where no landmarks are detected, preventing UI glitches and improving user experience. His work fixed a translation-related bug, contributing to more stable and maintainable sample applications overall.