Worked on the eclipse-openj9/openj9 repository to enhance build reliability and cross-platform compatibility. Addressed CI build stability by ensuring environment variables were correctly propagated to Jenkins build scripts, reducing environment-specific configuration issues and minimizing build flakiness. Later, implemented explicit charset handling for generated source files, particularly improving file operations on platforms like z/OS by enforcing IBM-1047 encoding. This approach eliminated reliance on platform-default charsets, increasing portability and consistency of generated sources. The work leveraged Java and Groovy, with a focus on build automation, CI/CD, and robust file handling to support safer, more predictable builds across diverse environments.