In which cases would you prefer Django, and in which FastAPI, and how to divide responsibilities?

Django is preferred for projects where rapid development with ready-made solutions is important: administrative panel, ORM, authentication, templates, etc. It is an excellent choice for classic web applications with server-side logic, where comprehensive infrastructure and standardization are important.

FastAPI is better suited for creating high-performance APIs, especially if asynchronous processing, response speed, and a modern approach to data typing and validation are important. FastAPI is often used for microservices, where a lightweight and fast backend is needed.

Division of responsibilities:

• Django — for full-fledged web applications with server-side logic, where complexity and ready-made tools are important.
• FastAPI — for API services, microservices, where high performance and asynchrony are required.

Example: if you need to create a site with an admin panel and user interface — Django. If you need to create a REST API for a mobile application — FastAPI.