Contributed to the langgenius/dify repository by delivering two backend features focused on code quality and maintainability. Enhanced the OpenAI moderation module by replacing bare dictionaries with explicit type annotations, improving type safety and code clarity using Python’s typing system. Modernized the test suite for the clean notion document task by migrating tests to SQLAlchemy 2.0 APIs, introducing helper functions for document and segment counting, and aligning tests with current standards. The work emphasized backend development and robust testing practices, resulting in a more maintainable codebase and streamlined development workflows without introducing any new bugs during the period.