Architecture Best Practices

Apply these principles when designing systems, reviewing structure, or making architectural decisions.

Core Principles (Language-Agnostic)

SOLID

• Single Responsibility: One reason to change per class/module
• Open/Closed: Open for extension, closed for modification (use interfaces/protocols)
• Liskov Substitution: Subtypes must be substitutable for base types
• Interface Segregation: Many focused interfaces > one fat interface
• Dependency Inversion: Depend on abstractions, not concretions