During March 2025, this developer built a reusable TimeRemaining countdown component for the khoanguyen-st/greenPREP repository, focusing on front end development with React and JavaScript. The component standardizes the countdown user experience across multiple skill sections by providing consistent time formatting, a visual progress bar, and an auto-submit action triggered upon timer expiry. Designed for integration throughout the application, it streamlines user workflows and supports faster rollout of future features. The work emphasized modularity and reusability, enabling a unified approach to time-based interactions within the app while maintaining clear, maintainable code and enhancing the overall user interface consistency.