Usually it is a short hand for "back end web developer", which deals with the "server side",the devs hidden in the closet that never sees the day light.
But depending on the team/product/perspective the term can replace any kind of technology/developer, example: on mobile backend is the code that deals with the server calls, on the server side is the part that deals with the persistence, and so on.
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I wrote about this term, and it is a matter of perspective.
Usually it is a short hand for "back end web developer", which deals with the "server side",the devs hidden in the closet that never sees the day light.
But depending on the team/product/perspective the term can replace any kind of technology/developer, example: on mobile backend is the code that deals with the server calls, on the server side is the part that deals with the persistence, and so on.