Worked on the Santa-TeresaERP/ST-backend and ST-frontend repositories to enhance user management workflows with a focus on security and data integrity. Developed role-based access control middleware and a password change endpoint using Node.js and Express.js, enabling granular authorization and improved self-service. Implemented soft-delete functionality for user accounts, preserving historical data while disabling access. On the frontend, built a Change Password feature and integrated confirmation modals for user management actions using React and TypeScript, reducing accidental changes. These features collectively strengthened security and improved the user experience, demonstrating a comprehensive approach to cross-stack development and robust API design.