Backend Architecture¶

The backend of Atlas ERP is a monolithic REST/GraphQL API built with NestJS 11. It is responsible for handling all business logic, database interactions, authentication, and background job processing.

Core Design Principles¶

1. Modular Architecture: The application is divided into feature-specific modules (e.g., FinanceModule, HrModule, ProjectModule). This makes the codebase easier to navigate and allows teams to work independently.
2. Dependency Injection: NestJS's robust DI container is used extensively to keep code testable and loosely coupled.
3. Data Transfer Objects (DTOs): All incoming request bodies and query parameters are strictly validated using DTO classes decorated with class-validator.
4. Prisma ORM: Database access is abstracted through Prisma, providing type-safe queries.

In this section¶

• Project Structure — How the apps/api directory is organized.
• Modules — Deep dives into specific business domains (e.g., HR Module, Finance Module).
• Guards & Middleware — How requests are secured and transformed.
• Error Handling — Standardized error responses across the API.
• Testing — Unit and End-to-End testing strategies for the backend.