Worked on the coze-dev/coze-loop repository to deliver configurable input/output previews and an agent metadata API, focusing on backend development and database management using Go. Developed API endpoints for managing column extraction configurations and retrieving agent metadata, supporting scalable configuration management and improved observability. Enhanced the database initialization process with idempotent SQL seeding and robust error logging, while refactoring configuration logic into a standalone repository for maintainability. Added comprehensive unit tests to ensure reliability of new features, particularly around configuration upserts and metadata retrieval. The work laid a foundation for future extensibility and maintainable code, emphasizing test coverage and modular design.