Platform as a service (PAAS) and Software as a Service (SAAS) both featuring computer software platforms and computer software for facilitating building contractor and customer interface, communication and scheduling, rating and reviews, cost estimating, and for building contractor job organization, tracking, billing, supply procurement, job-cost accounting, providing geographic directions to technicians and providing the customer real-time technician identity and location, and facilitating contractor and technician interface and time-keeping and enabling the technician and customer to take photographs and write notes on photographs for communicating problems back to contractor, and enable funds transfer for payment and includes customer ability to rate and review job performance