SERFCOMPANY
Hello, I'm a U.S.-based PHP/MySQL/Wordpress expert developer, and QR Code expert (I actually wrote a book in 2013 on QR Codes and mobile marketing, which is out of print, but a second edition is in the works). I have an assortment of strategies to offer for using QR Codes for nearly any purpose, smoothly capture data.
I also have extensive experience using the Twilio API, building apps such as pure marketing apps, response capture, analytics, reminder sending, and voice menus, inbound & outbound calling, etc.
I develop and implement Wordpress plugins as well for various purposes.
I can advise you on every aspect of this process and build out your integration to incorporate a "scan to clock-in" functionality, with the features you mentioned:
1. QR Code scans to log employee location & job.
2. Integration with ERP system for logging hours.
3. SMS send through Twilio API to notify supervisor of delays.