Final answer:
An individual who lobbies on behalf of their employer as part of their job is known as an in-house lobbyist. They are compensated for their work and advocate for the organization's interests.
Step-by-step explanation:
The individual described in your question is known as an in-house lobbyist.
An in-house lobbyist typically works within an organization and is responsible for lobbying on behalf of the organization's interests.
This differs from a volunteer lobbyist, who does not receive compensation for their lobbying activities and typically lobby on a more informal basis or for causes they personally support.