Construction contractors interested in performing construction contracts with the department must first complete the Vendor Registration process. Most contract opportunities are posted on Contracts Hub.To submit a bid, you'll need to log into PHLContracts. Instructions for submitting a bid can be found in the bid solicitation. Free and paid Proposals Bids classified ads. Browse Proposals Bids classified ads and free ads of the Inquirer. Bidders must fill in the Bid number and the due date (from the Bid) in the spaces provided. Learn about current bid and contract opportunities available to consultants, service providers, contractors, vendors, or suppliers. RFPs and bid proposals. The Process of Making Multimedia.