Quizzam

Quizzam is a REST backend API developed with NestJS, demonstrating mastery of modern software architecture patterns. This project was developed from scratch as part of training, with a particular focus on modular architecture and separation of concerns.

NestJS was chosen over pure Node.js for its predefined architecture and native TypeScript support, facilitating team development and ensuring better code maintainability. Unlike Node.js which lacks a standard software architecture, NestJS imposes rules and conventions that structure the project.

The application implements an architecture allowing to switch between different databases using dependency injection (MongoDB, Firebase) without modifying business logic, with an In-Memory adapter for tests. The CQRS pattern separates read and write operations, which can improve performance, scalability, and security of an application (even though in our case, it's a small fictional project that doesn't scale).

The authentication system is also flexible, supporting JWT and Firebase Auth depending on configuration. Complete E2E tests with Supertest and unit tests with Jest ensure code quality.