N.Y.C. Charter § 817: Section 817. Appointments and promotions.

a. All appointments, promotions and changes in status of persons in the public service of the city shall be made in the manner prescribed by the constitution of the state and in accordance with the provisions of the civil service law and other provisions of law not inconsistent therewith nor with this charter.

b. Whenever qualifications for the appointment of persons to public office are prescribed by law, the appointing officer shall, upon making such appointment, file with the civil service commission a certificate that such appointment complies with such law.