After building dozens of APIs with Django REST Framework, here are the practices that consistently lead to clean, maintainable, and performant APIs.
Always version your APIs from day one. Use JWT for authentication. Paginate every list endpoint. Use ViewSets with routers to reduce boilerplate. Write serializer-level validation rather than view-level validation. These patterns compound — each one makes the next easier.
The biggest mistake I see junior developers make is building APIs without thinking about consumers. Design your API from the client perspective first, then implement it. You will ship better APIs faster.