Mobile Service Sync Field App

The problem

The operator dashboard answers questions from a desk. The person doing the work is standing in a driveway holding a phone, sometimes with one bar, and the software has to be usable in that hand in that minute. A responsive web page is not that.

What got built

Expo with file-based routing through Expo Router: roughly fifty screens across five tabs, on the CRM's own Clerk instance so nobody signs up twice. The queries a technician actually needs (schedule, job, photos, add-ons) persist to device storage for a day through React Query's async persister, so a screen that loaded once still opens where the signal does not. Native maps, camera, and location cover the parts of the job that happen outdoors, and expo-updates ships a fix over the air without a store round trip.

Details worth naming

• Five tabs (home, schedule, search, timesheet, more) over roughly fifty screens: work orders, quotes, invoices, inspections, recurring jobs, messages, team, and time off.
• Clock in and out from the phone, with location used to suggest an accurate punch rather than to follow anybody around.
• Before and after photos go from the camera straight onto the work order.
• Card payment collected at the door through a hosted payment component, which only ever sees a short-lived key scoped to that one invoice.
• The day's schedule and job detail persist to device storage for twenty-four hours, so a dead zone does not empty the screen.
• Over-the-air updates through expo-updates, and a shared Clerk session with the web app.