You can use backroom to refer to people in an organization who do important work but are not seen or known about by the public. You can also use backroom to refer to a place where such people work. Public scrutiny had brought civil servants out from the backroom and into the spotlight. Mr Smith's backroom staff
the meeting place of a group of leaders who make their decisions via private negotiations
A backroom is a room that is situated at the back of a building, especially a private room. the backroom of the officers' club
disapproval If you refer to a deal made by someone such as a politician as a backroom deal, you disapprove of it because it has been made in a secret, dishonest way. They have been calling the Presidency decision a backroom deal
You can refer to a man as a backroom boy when he does important work in an organization and has good ideas but is not seen or known about by the public. someone such as an engineer or scientist whose work is important but who does not get much attention or fame