What architectural challenges have you faced when implementing projects?

When implementing projects in Python, I often encounter architectural challenges such as:

• Scalability: how to make the system grow without significant rework.
• Separation of concerns: proper division of code into modules and layers (e.g., presentation, business logic, data access).
• Dependency management: to avoid tight coupling of components.
• Error handling and logging: to make the system resilient and easy to debug.
• Performance optimization: especially when working with large volumes of data or network requests.

For example, in one project, I used the MVC pattern for clear separation of logic and applied Dependency Injection to simplify testing and code maintenance.