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This skill empowers developers to build maintainable, testable, and scalable backend systems by applying industry-standard architectural patterns. It provides expert guidance on implementing Clean Architecture for layer separation, Hexagonal Architecture for technology-agnostic cores, and Domain-Driven Design (DDD) for managing complex business logic. Whether you are architecting a new microservice from scratch or refactoring a tightly coupled monolith, this skill helps establish clear dependency boundaries and standardized directory structures to ensure your code remains agile and easy to evolve.