Our backend services help the application to do things like calculations, business logic, database interactions, and performance. Most of the code that is required to make an application work, happens only on the backend.
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No, it cannot, because the main role of the backend is to run continually and listen to requests, and then serve back content depending on the type of request.
A back-end web developer is responsible for server-side web application logic and integration of the work front-end developers do. Back-end developers are usually write the web services and APIs used by front-end developers and mobile application developers.