Worked on the slint-ui/slint repository to enhance error handling for Python callback decorators in asynchronous code. Addressed a specific bug where decorators were misapplied to undeclared async callbacks, introducing validation logic that prevents runtime errors and provides clear, actionable messages to developers. This improvement focused on backend robustness and aimed to streamline the developer experience by reducing time spent diagnosing decorator usage issues. Leveraged Python’s async/await patterns and decorator mechanisms, along with backend development skills, to ensure that callback integration is reliable and maintainable. The work contributed to more stable code and improved guidance for Python developers using async callbacks.