Online platform as a service (PAAS) featuring computer software platforms for project management services targeted to the building, real estate and construction industry, which allows general contractors, subcontractors, architects and other parties working on a construction project to: remotely create, access, store and transmit data and documents and collaborate on said data and documents; promote and advertise construction services and materials; invite and submit construction work and materials bids; manage and create construction field documents such as timesheets, daily reports, schedules and punch lists; track and audit construction finance documents such as change orders, payment applications and invoices; and manage and facilitate online collaboration of subcontractors, architects, engineers and owners