Architecture patterns

Skill agisota/old-one/skills/architecture-patterns

Implement proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design. Use when architecting complex backend systems or refactoring existing applications for better maintainability.From its SKILL.md

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npx -y skills add agisota/old-one --skill architecture-patterns

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SKILL.md

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Architecture Patterns

Master proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design to build maintainable, testable, and scalable systems.

When to Use This Skill

Designing new backend systems from scratch
Refactoring monolithic applications for better maintainability
Establishing architecture standards for your team
Migrating from tightly coupled to loosely coupled architectures
Implementing domain-driven design principles
Creating testable and mockable codebases
Planning microservices decomposition

Core Concepts

1. Clean Architecture (Uncle Bob)

Layers (dependency flows inward):

Entities: Core business models
Use Cases: Application business rules
Interface Adapters: Controllers, presenters, gateways
Frameworks & Drivers: UI, database, external services

Key Principles:

Dependencies point inward
Inner layers know nothing about outer layers
Business logic independent of frameworks
Testable without UI, database, or external services

2. Hexagonal Architecture (Ports and Adapters)

Components:

Domain Core: Business logic
Ports: Interfaces defining interactions
Adapters: Implementations of ports (database, REST, message queue)

Note

Skill content truncated for token efficiency. Full version available in the source repository.