The World Health Organization (WHO) became the first UN agency to establish an Open Source Programme Office (OSPO), positioning the institution as a leader in applying open-source governance and innovation to global health. In partnership with GitHub since 2020, WHO has strengthened its innersource development practices and expanded its open-source ecosystem to more than 100 repositories. To ensure this ecosystem remains secure, reliable, and well-maintained, WHO needed a consistent way to evaluate performance and identify areas for improvement. Through GitHub’s Social Impact Skills-Based Volunteering program, GitHub employees provided technical support to help develop tools and processes that enhance WHO’s open-source governance and operational maturity.