QR-Based Stock Tracking App (Web/PWA)

Simple QR-Based Stock Tracking System for Plumbing Business (Web App / PWA)
Job Description
I’m looking for a developer to build a simple, fast stock-tracking web app for a plumbing & heating business.
The system will allow plumbers to:
scan a QR code on a storage box
enter a job number and quantity taken
submit in under 10 seconds on a phone
The office needs:
visibility of materials used
stock level tracking
ability to export materials by job and add them to Tradify (job management software)
This is not a full ERP or warehouse system.
No real-time Tradify API integration required.
Simplicity and speed are critical.
Key Requirements
Mobile-friendly web app or PWA
QR codes identify storage boxes automatically
Minimal user input (job number + quantity)
Admin dashboard for stock & usage
CSV export compatible with Tradify
Designed for real-world tradespeople (fast, simple)
Nice to Have
Offline capture with sync later
Low-stock alerts
Clean, minimal UI
Important
I already have a very detailed workflow and requirements document.
Shortlisted developers will receive the full brief.
Please include:
Relevant experience
Suggested tech stack
Estimated timeline
Rough cost range