architecture-patterns

Clean Architecture organizes code into layers—entities, use cases, and adapters—with inward dependency flow so business logic stays independent from frameworks. This separation enables testability, maintainability, and technology-agnostic core logic that survives framework changes.

Hexagonal Architecture (ports and adapters) and Clean Architecture share the same core goal: isolating domain logic from external dependencies. Hexagonal emphasizes symmetrical boundaries and explicit ports; Clean Architecture layers dependencies more formally, but both achieve framework independence and testability.

Domain-Driven Design uses strategic patterns—bounded contexts, ubiquitous language—and tactical patterns—aggregates, repositories, domain events—to model rich, cohesive domains. This approach clarifies ownership, reduces coupling, and aligns code structure with business requirements.

Yes. By applying Clean Architecture or Hexagonal patterns, you isolate business logic from framework details, extract domain models, define repositories for data access, and introduce domain events for decoupling. This enables gradual migration to microservices or modular monoliths.

A canonical structure organizes code by layers (entities, use cases, adapters) or domains (bounded contexts), each with clear input and output boundaries. This structure makes dependencies explicit, supports parallel development, and simplifies testing in isolation.

Yes. Clean Architecture and Hexagonal patterns are framework-agnostic; FastAPI and async tools like asyncpg operate as adapters in the presentation and data layers, leaving core business logic independent and testable regardless of async implementation details.