Developed and integrated advanced authentication features across the ncc-erp-workflow-w2 and ncc-erp-ams-fe repositories, focusing on secure, hash-based login pathways. Leveraged C#, JavaScript, and React to implement a new API endpoint supporting hash verification and user management on the backend, while introducing Mezon hash authentication in the frontend using the Mezon web SDK and a custom login hook. This work enabled alternative authentication methods, streamlined user onboarding, and enhanced security posture across platforms. The approach emphasized robust API development and seamless frontend-backend integration, laying a foundation for future identity solutions and reducing friction for both new and existing users.