Worked on the langgenius/dify repository, focusing on backend development with Python to enhance code maintainability. Delivered a targeted refactor of the AsyncWorkflowService class by removing unnecessary type annotations from task variables, which reduced cognitive load for future contributors and simplified the codebase without affecting runtime behavior. This change was carefully implemented to ensure no regression, supported by existing tests and code reviews. By streamlining type usage, the work improved code readability and laid a foundation for safer future modifications. The approach demonstrated attention to maintainable engineering practices and a clear understanding of Python’s type system in backend service contexts.