Jayeeliu worked on backend and API development across the langgenius/dify and ai-shifu/ai-shifu repositories, focusing on reliability and cross-platform compatibility. For langgenius/dify, Jayeeliu refactored the PHP SDK to centralize HTTP requests through a single Guzzle client and introduced Composer configuration, streamlining dependency management and improving maintainability for PHP projects. In ai-shifu/ai-shifu, Jayeeliu addressed Windows compatibility by enforcing UTF-8 encoding and resolving path separator issues, ensuring the API runs smoothly on Windows systems. The work demonstrated solid skills in PHP, Python, and dependency management, with a focus on practical improvements and robust, maintainable code.