During January 2025, Dat Le upgraded the laravel/laravel repository to Tailwind CSS v4.0, focusing on modernizing the project’s frontend architecture. He updated CSS configuration and imports to align with the latest Tailwind conventions, leveraging new features to improve UI consistency and maintainability. Using JavaScript, CSS, and build tools like Vite, Dat ensured the upgrade process included thorough validation and regression checks, maintaining UI stability throughout. Although no major bugs were addressed, his disciplined approach to dependency management and clear commit traceability demonstrated strong engineering practices. The work enabled faster design iteration and standardized styling across the project.