During January 2026, Wada enhanced the Evolveum/midpoint repository by implementing Certification Decision Deadline Enforcement, a backend feature in Java that prevents certification decisions from being submitted after stage deadlines. This required integrating deadline validation logic into the core workflow and collaborating across the midpoint-localization module to introduce user-friendly error messaging when deadlines are exceeded. By focusing on backend development and software engineering best practices, Wada improved process integrity and reduced compliance risk while clarifying error handling for users. The work demonstrated thoughtful cross-repository coordination and addressed both business and user experience needs through targeted, maintainable code changes.