Worked on the hmcts/civil-ccd-definition and hmcts/civil-wa-task-configuration repositories, focusing on test reliability and security hardening. Improved the civil-ccd-definition test suite by correcting discontinuance header expectations and aligning test fixtures with actual behavior, which reduced flakiness and increased CI confidence. Managed the change lifecycle with controlled reverts to ensure stability during validation. In civil-wa-task-configuration, delivered a configuration-based CVE suppression approach, mitigating vulnerabilities without code changes and documenting the process for future use. Utilized JavaScript for end-to-end and API testing, along with test fixture management, emphasizing traceability, maintainability, and secure, configuration-driven engineering practices throughout the work.