Developed a security-focused authentication enhancement for the Cacti/cacti repository, standardizing login error responses to prevent user enumeration and conceal whether a username exists. This feature aligned error messages for invalid passwords and usernames, reducing information leakage and supporting a consistent security posture. The work demonstrated expertise in PHP back end development and adherence to security best practices, particularly in error handling and least-privilege disclosure within authentication flows. By unifying error paths, the implementation reduced the attack surface and improved audit consistency, reflecting a methodical approach to risk mitigation and traceable, commit-driven development within a widely used open-source monitoring platform.