Frostline - HVAC Field Service App

Overview

Frostline is a two-sided field-service app for heating and cooling businesses. Homeowners raise a service request and follow their technician in real time; the office and the crew get one shared board — today’s jobs, the inbox, the schedule and the paperwork. The demo business used throughout is Birchline Heating.

For the customer

• Raise a request in a few taps — no heat, no cooling, a strange noise or just a tune-up, with a note, a photo of the unit and a gas-safety prompt
• Live technician tracking — an ETA, a map from the shop to the home and a plain-language job timeline (received → assigned → on the way → heat restored)
• Equipment record per home — install year, warranty, service history and health, with automatic tune-up reminders
• Approve quotes — itemised supply/labour with tax, plus an optional yearly tune-up plan and a direct line to the technician

For the owner and crew

• Today — jobs, new requests, money to collect and a live view of who is on the way, on site or free
• Inbox — request detail with the customer’s equipment history and one-tap assignment to the nearest technician who has the parts
• Schedule — the day by time slot, with an unassigned request pinned to the top
• On site — a job checklist, before/after photos and a running time-on-site clock
• Job done — time on site, parts and labour rolled into an itemised total and an invoice ready to send

Design

A navy and safety-orange palette with big, calm type and card-based layouts. Every screen leads with a single filled action, and status is always carried by both a colour and a word, never colour alone.

Tech stack

• Flutter — one codebase covering both the customer and the technician experiences
• Field service domain model — customers, equipment, requests, jobs, quotes and invoices
• Scheduling — time-slot day view with technician assignment and live status
• Invoicing — itemised parts and labour with tax and scheduled reminders