Worked on the EruditorGroup/profi-design-system repository to enhance compatibility with React 19, focusing on the CSSTransition components used in BottomSheet and Modal. Addressed a key bug by introducing nodeRef to replace the deprecated findDOMNode method, which improved the stability of UI animations and reduced potential runtime errors under the new React version. Utilized JavaScript and TypeScript to implement these changes, ensuring the design system’s components are forward-compatible and maintainable. The work centered on front-end development and UI component reliability, with careful attention to animation lifecycle management using react-transition-group, resulting in a smoother upgrade path for React 19 adoption.