Answer: The answer is "mechanistic".
Your firm has a "mechanistic" structure.
Explanation: The mechanistic organization, emphasizes the rules and tries to imitate the standardized operation of a machine. In this type of organization people have little autonomy and there is no room to improvise. Thus, the adoption of the chain of command principle allows the existence of a hierarchy of formal authority, where each person is controlled and supervised by a single superior.
Organizations that follow this model tend to be impersonal, rigid, and regulated.