Is it optimal to use the backend as the main architectural component of the project?

The use of the backend as the main architectural component of a project depends on the type of application and its requirements. In most cases, the backend is responsible for business logic, database operations, authentication, and interaction with external services, making it critically important.

However, if the project requires high interactivity and responsiveness of the interface, some logic can be moved to the frontend (e.g., using SPA). Modern architectures often employ microservices and distributed systems, where the backend is just one part.

The appropriateness of using the backend as the main architectural part depends on:

• security and data processing requirements;
• scalability needs;
• user experience features;
• technical constraints.

Example: in a traditional web application with server-side rendering and complex business logic, the backend will be the main part. In SPA with a rich client interface, part of the logic is transferred to the frontend.