Worked on modernizing the API contract for the NHSDigital/validated-relationships-service-api repository by upgrading its OpenAPI Specification from version 1.14.0 to 1.15.0. This update focused on aligning the API with the latest standards, improving downstream compatibility, and preparing the service for future enhancements and fixes. The work involved careful management of the OpenAPI lifecycle, ensuring traceable and versioned changes using YAML for specification updates. No major bugs were addressed during this period, but the feature delivered established a foundation for safer, more maintainable API development. Demonstrated skills included API development, specification versioning, and structured documentation practices.