Andrew Davidson contributed to the nhsuk/manage-vaccinations-in-schools repository by enhancing documentation for test user creation, updating the README to clarify task parameters and provide practical usage examples. He focused on improving clarity and consistency in developer workflows, using Markdown and DevOps practices to ensure the documentation accurately reflected current processes. In the NHSDigital/manage-vaccinations-in-schools-testing repository, Andrew refactored the Mavis testing API routing, standardizing all endpoints under a unified path to improve test reliability and maintainability. Leveraging Python and performance testing tools like JMeter, his work addressed both usability and technical correctness, demonstrating a methodical approach to targeted engineering improvements.