Worked on the bernardobelchior/mui-x repository, focusing on refining the DataGrid component’s user experience. Addressed a nuanced bug where the No Rows overlay appeared even when pinned rows were present, leading to potential user confusion in edge cases. The solution involved updating the overlay logic to accurately account for pinned row counts, ensuring the No Rows state only displays when truly appropriate. This change improved correctness and consistency across the component’s UI flows. The work demonstrated careful attention to regression risks and edge-case validation, utilizing TypeScript, React, and front-end component development skills to deliver a targeted, user-facing bug fix.