Worked on enhancing the stability of user lifecycle management in the keycloak/keycloak repository, focusing on backend development with Java. Addressed a critical issue in the UserStorageEventListener by implementing robust error handling for scenarios where a realm is missing during user deletion. The solution prevents exceptions by logging debug messages and allowing operations to continue, thereby reducing administrative disruption during realm deletions. This approach improved the reliability of user storage management and minimized troubleshooting time for administrators. The work demonstrated a strong emphasis on error handling and backend reliability, leveraging Java to strengthen the overall resilience of the system.