Layered Architecture for Building Readable, Robust, and Extensible Apps

Poor application structure, rather than code quality, often makes adding features feel risky and slow. A layered architecture can solve this by separating responsibilities into Interface, Application, Domain, Repository, and Infrastructure layers, with dependencies flowing inward. This isolates core business logic from frameworks and databases, making the system more readable, robust, and easier to test. For larger applications, vertical slicing by domain is recommended to prevent layers from becoming disorganized. This architectural approach preserves momentum by making change cheaper and safer over time.