Over a two-month period, contributed backend enhancements to the pagopa/pn-user-attributes and pagopa/pn-auth-fleet repositories, focusing on stability and maintainability. Upgraded the pn-commons library to ensure Spring Boot 3 compatibility, centralizing dependency management and simplifying future updates using Java and YAML. In the pn-auth-fleet project, improved the Lollipop authorization flow by enforcing mandatory user ID validation and removing blocking conditions on tax ID checks, which increased reliability and security. Extended and stabilized test coverage for these changes, leveraging JavaScript and Node.js to ensure deterministic behavior and robust handling of user and tax ID scenarios across the authorization stack.