Jayee Liu developed and enhanced backend systems across two repositories, focusing on practical improvements to developer experience and cross-platform reliability. For langgenius/dify, Jayee refactored the PHP SDK by consolidating HTTP requests through a single Guzzle client and integrating Composer for streamlined dependency management, while expanding documentation to support easier API integration. In ai-shifu/ai-shifu, Jayee addressed Windows compatibility by enforcing UTF-8 encoding and resolving path separator issues, ensuring the API runs smoothly on Windows environments. Working primarily with PHP and Python, Jayee’s contributions demonstrated a methodical approach to maintainability and platform support, delivering targeted solutions to real integration challenges.