Before you send in your next bid, read on to learn how to write a bid proposal for freelance work that will win you projects in no time! In order to fulfill this requirement, you must complete the Vendor Responsibility Questionnaire.To file invoices for all DEP contracts, vendors must use the DEP Invoice Platform. Vendors will need to create an account upon initially accessing the platform. Sign the bid form manually in ink. Download this free bid proposal template for Word to outline how the contractor intends to fulfill the project requirements.