Worked on backend and API development across two repositories, focusing on practical improvements to integration and platform compatibility. In langgenius/dify, refactored the PHP SDK to centralize HTTP requests through a single Guzzle client and introduced Composer configuration, streamlining dependency management and simplifying API integration for PHP projects. Expanded developer documentation to guide users through installation and usage. In ai-shifu/ai-shifu, addressed Windows compatibility by enforcing UTF-8 encoding and resolving path separator issues, ensuring the API runs reliably on Windows systems. Leveraged PHP and Python, with attention to dependency management and cross-platform reliability, resulting in more maintainable and accessible codebases.