Hello,
I have read your requirement carefully.
I am a senior NFC and RFID export.
I have rich experience in access and attendance system based on NFC and RFID.
Also I am familiar to develop software for NFC/RFID reader.
Hope to discuss more detail via PM.
Thanks and regards,
Peng
P.S. Instead of RFID tag, using mobile app. Yes. it's very interested.
But we can use mobile device as NFC, not RFID.
NFC range is a few cm, very shorter than RFID.
Maybe we cannot use mobile device, but we can use bluetooth instead of RFID.
Thanks again.