Worked on the opensafely/documentation repository to deliver and refine governance documentation for the National Data Opt-Out implementation, focusing on data privacy and healthcare compliance. Developed clear, policy-aligned documentation in Markdown that details data handling, access permissions, and enforcement mechanisms, supporting transparency and audit-readiness. Updated technical descriptions to reflect current workflows, removing outdated references and clarifying processes for developers and data stewards. This approach reduced onboarding time and minimized misconfiguration risks by ensuring documentation accurately matched system behavior. Emphasized maintainability and clarity, leveraging technical writing skills to support ongoing compliance and facilitate future updates within the healthcare data governance context.