Worked on the NHSDigital/personal-demographics-service-api repository to enhance CI-driven CA trust handling and improve test reliability for backend healthcare workflows. Introduced a feature flag in Java to toggle CA trust behavior for example.org within CI, allowing teams to revert to previous settings if needed and reducing CI flakiness. Updated authentication tests to handle redirects more robustly under new CA configurations, ensuring reliable healthcare worker login flows. Addressed a blocking issue by adding an ignore flag to bypass a failing stillbirth PDS creation test, enabling continued development. Demonstrated skills in API development, backend engineering, and automated testing using Java and Python.