The Department of Finance shall be in charge of the Director of Finance, appointed by the Mayor to serve at his pleasure. The Director of Finance shall have charge of the financial affairs of the City, including the keeping and supervision of all accounts; the custody and disbursement of City funds and moneys; the making and collection of special assessments, the issuance of licenses and the collecting of license fees; the control over expenditures; and such other duties as the Council may by ordinance require.