architecture-planner

Layered architecture separates concerns into presentation, business, and data layers. Define component boundaries within each layer, specify dependencies between layers, and ensure each layer has a single responsibility. This approach maintains testability and makes refactoring easier as your codebase grows.

Layered architecture organizes code into horizontal tiers (presentation, business, data). Hexagonal architecture uses ports and adapters to decouple your core business logic from external dependencies like databases and APIs. Hexagonal offers more flexibility for testing and swapping integrations.

Apply dependency injection to decouple components, define clear interfaces between layers, and separate business logic from infrastructure concerns. This structure lets you test components in isolation, swap implementations without touching core logic, and add new features without breaking existing code.

Yes. Clean architecture helps you incrementally refactor by establishing clear layer boundaries, extracting business logic from framework code, and introducing dependency injection. Start with high-risk or frequently-changed modules, then extend the pattern across your system.

Ports define contracts for how external systems interact with your core logic; adapters implement those contracts for specific technologies. This pattern isolates business rules from database, API, and UI details, making your system testable and adaptable to technology changes.

Apply single responsibility during initial design and refactoring to prevent god objects and tangled dependencies. Each module should have one reason to change. This keeps components focused, easier to test, and reduces the blast radius when requirements shift.