Over two months, this developer enhanced API reliability and contract clarity across multiple DEFRA repositories, including epr-facade-account-microservice and epr-payment-service. They focused on aligning HTTP response status codes and error handling with Swagger and OpenAPI specifications, ensuring that API documentation accurately reflected backend behavior. Using C# and leveraging skills in RESTful API development, Swagger documentation, and unit testing, they standardized response semantics, improved error handling, and clarified return types. Their work addressed SonarQube issues, improved client integration, and maintained traceability through detailed commit references, resulting in more maintainable, predictable APIs and a better developer experience across DEFRA services.