Over a two-month period, contributed targeted improvements to open source infrastructure projects, focusing on reliability and security. In alibaba/nacos, enhanced the startup script by replacing bash-specific syntax with POSIX-compliant shell scripting, simplifying the startup flow and ensuring robust cross-platform compatibility for Linux, macOS, and containerized environments. The work emphasized maintainability and system administration best practices. In apache/dubbo, implemented Java-based security tests to strengthen YAML deserialization, preventing unsafe class processing and reducing vulnerability risks. Leveraging skills in DevOps, Java, and security testing, delivered focused solutions that improved code quality, test coverage, and operational safety in critical system components.