As a hobby project, I have been developing a custom product, Upgrade.ai Online Customer Service and Marketing System. Initially, the core backend main program had no web interface, which often resulted in 404 errors for users after deployment. Irritated by this issue, I realized that a backend-only API project was not suitable for users who expected a working web application. In version 1.x, I addressed this problem by using a workaround, introducing a basic web interface for the backend API. However, I soon discovered that even this approach had limitations, particularly around security and maintainability. Therefore, I decided to rethink the design of my product and implement a more robust solution that integrated backend API with a separate frontend interface. In this article, I will share my experiences and lessons learned from this process, providing insights into how I refactored my project to achieve better separation of concerns, improved security, and enhanced maintainability.