Conducts competitive bids by writing bid specifications, preparing bid requisition documents, receiving and analyzing submitted bids, conducting public bid openings, preparing bid summaries, and posting intent to award bid. Processes requisitions and invoices, contacts vendors, and assigns or secures purchase order numbers. Maintains vendor files and updates data as needed. Communicates with accounts payable, to ensure proper payment of invoices, and performs assigned accounting duties. Provides technical customer service support to other departments and employees regarding purchasing and the purchasing system software. Enters data into complex databases and systems and develops queries to gather information and prepare reports. Performs other duties as assigned.