Worked on the mui-x repository to address a critical user interface issue affecting the Picker component. Focused on front end development using React and TypeScript, the work involved fixing a bug where the disabled state of the Picker component incorrectly overrode the error border color. This targeted fix improved visual consistency and reduced the risk of user confusion or misinterpretation when interacting with disabled elements. The solution emphasized code quality and maintainability, with collaborative development practices reflected through co-authorship. By resolving this visual bug, the developer contributed to a more reliable and user-friendly experience without introducing new features during the period.