Manuel worked on refactoring the status code and attribute list verification flow in the pagopa/pn-b2b-client repository, focusing on backend development with Java and testing. He replaced the httpCallExecutor with a results-based approach in the verifyStatusCodeAndAttributeList method, which reduced boilerplate code and improved maintainability. This change streamlined the verification process, making it more reliable and easier to validate client integrations. Manuel also updated the TenantRequesterCertifiedAttributesSteps to align with the new verification logic. The work enhanced test readability and accelerated feedback in continuous integration, demonstrating a thoughtful approach to improving code quality within a targeted project scope.