A posting clerk works in the billing and financial departments of various businesses and organizations, from hospitals to trucking companies. In this career, your job duties include compiling data, computing fees, tracking payments, preparing invoices, calculating rates for goods or services, and keeping all information updated and organized. Recordkeeping procedures often include using a computer, calculator, or other bookkeeping machines or software, so typing, math, and technology skills are vital. You must also have customer service experience and should be able to communicate well to explain charges or policies.