Advanced PWA Web based QR-vCard Platform

I’m building a production-grade Progressive Web App that runs smoothly as a PWA/Web app on both iOS and Android. Its primary job is to display and / or scan QR codes. Where it scans QR code, it pulls... (Budget: $250 - $750 AUD, Jobs: Analytics, Android, API Integration, Frontend Development, iPhone, JavaScript, JSON, Mobile App Development, PHP, Web Development)