Clean Architecture & Onion Variants

Clean Architecture and its Onion cousins focus on protecting your core business logic by putting it in the middle, surrounded by rings of less-important code. This makes your codebase easier to test, change, and scale—even as technology shifts.

It's like a medieval castle. The important people and treasures are deep inside, protected by layers of walls and guards. Attackers must get through every layer, so your valuables stay safe.

• Inner ring: Pure business logic
• Outer rings: Interfaces, frameworks, databases
• Dependency flow: Always points inward, protecting the core