Worked on the frappe/hrms repository to deliver security enhancements for HR workflows, focusing on leave allocation and roster management. Developed and integrated comprehensive permission checks to enforce authorization for critical operations, including manual leave allocation, shift insertion, and next shift deletion. Leveraged Python for backend development and applied security best practices to ensure only authorized users could perform sensitive actions, thereby improving data integrity and auditability. The approach emphasized precise, descriptive commits and cross-team collaboration, laying the foundation for scalable role-based access control. Demonstrated skills in API development, backend authorization design, and permission management within a collaborative engineering environment.