Worked on backend development for the pocket-id/pocket-id repository, focusing on targeted improvements to authentication and email systems. Addressed error handling in the OIDC authentication flow by clarifying callback URL error messages, providing users and administrators with actionable guidance during misconfigurations to streamline sign-in troubleshooting. Enhanced email deliverability by updating header formatting and adding a Message-ID, reducing the risk of transactional emails being flagged as spam by rspamd and improving inbox placement. Utilized Go for backend logic, with an emphasis on robust error handling and email service reliability. The work prioritized user experience and operational efficiency over new feature development.