During November 2024, Cardinal focused on backend robustness within the misskey-dev/misskey repository, addressing a critical issue in ApPersonService. By implementing a null fallback for missing sharedInbox properties, Cardinal ensured that if both person.sharedInbox and person.endpoints?.sharedInbox were absent, sharedInbox would be explicitly set to null. This TypeScript-based solution prevented undefined property errors and improved data handling reliability across backend services. The work enhanced stability for downstream consumers relying on sharedInbox, reducing the need for additional error handling. Cardinal’s contribution, though limited to a single bug fix, demonstrated careful attention to backend development practices and code quality standards.