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LLDsystem_design~12 mins

Clean Architecture layers in LLD - Architecture Diagram

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System Overview - Clean Architecture layers

Clean Architecture organizes software into layers to separate concerns and improve maintainability. It ensures that business rules are independent of frameworks, UI, and databases, making the system easier to test and evolve.

Architecture Diagram
User Interface (UI)
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Application Layer
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Domain Layer
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Infrastructure Layer
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External Systems (Database, Web, etc.)
Components
User Interface (UI)
layer
Handles user interactions and displays information
Application Layer
layer
Coordinates application activities and business use cases
Domain Layer
layer
Contains business rules and domain entities
Infrastructure Layer
layer
Manages external systems like databases and web services
External Systems
external_system
Databases, web services, and other external resources
Request Flow - 8 Hops
User Interface (UI) → Application Layer
Application Layer → Domain Layer
Domain Layer → Infrastructure Layer
Infrastructure Layer → External Systems
External Systems → Infrastructure Layer
Infrastructure Layer → Domain Layer
Domain Layer → Application Layer
Application Layer → User Interface (UI)
Failure Scenario
Component Fails:Infrastructure Layer
Impact:External system calls fail, causing data persistence or retrieval to break
Mitigation:Use retry mechanisms, fallback caches, and isolate failures to prevent domain logic disruption
Architecture Quiz - 3 Questions
Test your understanding
Which layer contains the business rules and core logic?
AApplication Layer
BDomain Layer
CInfrastructure Layer
DUser Interface (UI)
Design Principle
Clean Architecture separates concerns by organizing code into layers that depend inwardly, keeping business rules independent from UI and infrastructure. This improves testability, flexibility, and maintainability.