A native or progressive web app on the technician's phone or tablet that gives them everything they need for each job before they arrive and a structured workflow for capturing what happened after. Before arrival: job details including customer name, site address, access instructions, equipment make/model and service history, parts and tools needed, and any previous job notes from the last visit. On-site: structured digital checklists tailored to the job type (HVAC service inspection has different steps than electrical fault diagnosis), time recording (clock-in on arrival, clock-out on departure captured automatically from GPS), parts used logged against the van stock, and a free-text or voice-to-text notes field for findings and recommendations. Photo capture attached to specific checklist items, a photo of the fault, the repair, and the completed work, timestamped and geotagged and stored on the job record. Customer signature captured on-screen for job sign-off, generating a PDF job completion certificate sent to the customer immediately. When the technician marks the job complete, the office team sees the status change in real time, invoice generation triggers automatically, and parts consumption updates the inventory system, no paper to transfer, no data to re-key.