Dispatch Platform for Plumbing and HVAC Field Crews

We need a web application to manage the daily operations of a plumbing and HVAC systems company. The core is a dispatch board where the coordinator drags open tickets onto technician timelines and immediately sees conflicts, travel time, and qualification match. Each ticket carries a work type, priority, promised arrival window, and required certifications, so the scheduler suggests only technicians who can actually perform the job. The route is built from the technician's current location and remaining visit addresses for the day; the app suggests an optimized route and recalculates it when an urgent call bumps into the queue. The warehouse module tracks inventory on each van and at the central depot, deducts items as they are used in work orders, and raises an alert for reordering when stock drops below threshold. Customers book through a public page showing only genuinely free slots for their service zone. Technicians open digital work orders on a tablet, log hours, add photos, capture customer signatures, and turn a closed order into an invoice with taxes and payment status. Result: responsive dispatcher interface, online booking form, mobile technician view, REST API, MySQL schema, role-based access, PDF invoices, and setup documentation.