During November 2025, Gu Jincheng enhanced the pinterest/starrocks repository by developing comprehensive upgrade documentation focused on Custom UDF Handling Instructions. Leveraging technical writing and documentation skills, Gu clarified upgrade steps, addressed edge cases, and outlined rollback procedures for users with custom user-defined functions. The work, authored in Markdown, aimed to reduce upgrade risks and support overhead by making the process more transparent for both users and contributors. By aligning the new documentation with existing contributor guidelines, Gu improved maintainability and facilitated onboarding for new team members. The contribution demonstrated depth in technical communication and attention to upgrade reliability concerns.