Worked on the vercel/examples repository to deliver robust custom error handling and UI stability improvements using Next.js, React, and TypeScript. Developed custom 5xx error pages with the Next.js App Router, integrating request ID and error code tokens to enhance error traceability and support. Designed descriptive error home pages and a timeout test route, ensuring accessible navigation and links to relevant GitHub examples. Updated demo pages to align with design guidelines, focusing on responsive layouts and accessible elements. Addressed UI rendering issues by refining font settings and layouts, resulting in improved visual consistency and cross-device responsiveness throughout the application.