Worked on security and reliability enhancements for the jumpserver/koko and jumpserver/jumpserver repositories, focusing on authentication and network management. Introduced token-based SSH authentication in Go, enabling passwordless logins when password authentication is disabled, which improved operational flexibility. Addressed SFTP storage reliability by fixing SSH key parsing in Python to correctly interpret escaped newline characters, ensuring stable connections. Enhanced the password-change process for network devices by adding support for older SSH versions and gateway arguments, increasing compatibility. Leveraged skills in automation, DevOps, and backend development to streamline cross-repository changes, reducing operational risk and support overhead while improving overall system robustness.