It depends. Simply being a director does not automatically grant the power to bind the company alone or to sign all documents on its behalf. Nor does the fact that the company has only one director mean that this director alone automatically possesses all signing powers on behalf of the company.
The powers of management are generally exercised by the board of directors, subject in particular to a unanimous shareholders' agreement in force that has removed certain powers from the board. The power to sign or act on behalf of the company may, however, be delegated to a director, officer, or other authorized person.
In many SMEs, certain individuals are authorized to sign contracts, bank documents, or other commitments on behalf of the company. These powers may be stipulated in the company's bylaws, a bank resolution, a board resolution, or other authorization.
Depending on the nature and significance of the transaction, prior approval from the board of directors may also be required. Banks and certain business partners may request a copy of a resolution, a duly signed extract of a resolution, or any other document confirming the authority of the person representing the company to conclude the transaction in question or a significant operation.
In summary , a director does not automatically possess, by virtue of their position alone, the power to bind the company. Before concluding a significant transaction, it is recommended to verify the powers granted to them and the required authorizations.