Federico Bartoli focused on enhancing security and session management in the keycloak/keycloak repository, addressing a critical issue with offline_access token handling. He implemented a targeted fix in Java to ensure that root authentication sessions are properly removed when users access offline tokens, preventing cross-user session contamination and aligning session termination with backchannel logout semantics. By leveraging his skills in back end development and testing, Federico reduced the risk of session leakage across browsers and improved the privacy of offline tokens. His work demonstrated a deep understanding of authentication flows and contributed to more robust session isolation within the Keycloak platform.