This application serves as a centralized authentication system, enabling users to securely log in to third-party platforms using a single, unified account. It simplifies the user experience by reducing the need for multiple credentials across different services, while ensuring strong security standards through token-based authentication, encryption, and identity verification mechanisms. The system is designed for scalability and can be easily integrated into external platforms via standard protocols such as OAuth or SAML. Our company was fully responsible for the end-to-end development of the entire system, including both the mobile application and the backend infrastructure, ensuring seamless performance, security, and cross-platform compatibility.