Layered architecture — also called N-tier architecture — is the most widely used architectural pattern in enterprise software. It organizes code into horizontal layers, each with a specific responsibility, where each layer can only communicate with the layer directly below it. If you have ever worked with a Spring Boot application structured into controllers, services, and repositories, you have already used layered architecture. This lesson explains the model in depth: why it works, where it breaks down, and how to avoid the most common traps.
ℹ️Layered architecture is the default starting point for most enterprise applications — not because it is the best architecture for every problem, but because its structure maps naturally to team organization, is universally understood, and imposes just enough discipline to keep small and medium systems maintainable.
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