What are the main principles of system design you usually apply in your work?

In my work, I usually apply the following core principles of system design:

• Single Responsibility Principle — each component or module is responsible for its specific task.
• Modularity and reusability — code is organized into independent modules that can be reused.
• Encapsulation — hiding internal implementation and providing only the necessary interface.
• Error handling and resilience — the system should respond correctly to errors and recover.
• Performance optimization and responsiveness — especially important for iOS applications to ensure a smooth user experience.
• Use of design patterns — such as MVC, MVVM, to structure code and simplify maintenance.

These principles help create maintainable, scalable, and reliable applications.