Core Architectural Principles

1. Separation of Concerns - Distinct layers for presentation, business logic, and data access

2. Loose Coupling - Minimize dependencies between components

3. High Cohesion - Group related functionality together

4. Domain-Driven Design - Organize around business domains

5. Dependency Inversion - Depend on abstractions, not concrete implementations

Architectural Layers

Presentation Layer

• Lightning Web Components

• Visualforce Pages

• Experience Cloud Components

Business Logic Layer

• Service Classes

• Domain Classes

• Selector Classes

Data Access Layer

• Unit of Work Pattern

• Repository Pattern

• Query Builders