One of the main challenges was handling concurrent transactions without data corruption. Ensuring thread safety and managing race conditions during simultaneous fund transfers was tricky. To overcome this, I implemented synchronization techniques in the backend, utilizing thread-safe operations and careful management of shared resources.

While building the banking system, I faced several technical challenges:

1. 401 Unauthorized: Initially, there were issues with user authentication, leading to a 401 Unauthorized error when users tried to access secure pages. To resolve this, I implemented JWT-based token authentication to ensure that only authorized users could access sensitive operations, such as fund transfers and loan processing.

2. 404 Page Not Found: During testing, users encountered 404 Not Found errors when navigating to certain routes. This was due to misconfigured routes in the backend API. After identifying the issue, I reviewed and corrected the API mapping to ensure that all routes were properly defined and that users could seamlessly navigate through the system.

3. CORS (Cross-Origin Resource Sharing): When connecting the frontend with the backend, I faced CORS issues because of different origins for the web application and the API. To solve this, I configured the server to allow cross-origin requests, ensuring that the frontend and backend could communicate without any restrictions.

4. API Mapping: Proper API mapping was essential for the smooth functioning of the system, particularly for managing banking transactions. Initially, some of the API endpoints weren’t correctly mapped, leading to failed requests. I resolved this by thoroughly reviewing the API documentation, aligning the frontend requests with the correct backend routes, and testing each one for