Hi,
I have experience for 20+ years in electronics/embedded development. I have several years of advanced AVR/arduino development, including library development from scratch. Practically all Arduino AVR boards used, like: 2009, 2010, UNO, MEGA, NANO, MICRO, MINI, etc. Several shields used like Ethernet (W5100, ENC28J60, etc.) with various IP protocols implementation, various graphical TFTs with and without touchscreen and various BUS types (parallel, SPI, I2C, etc.), all kinds of sensors and buses, serial and parallel memories, etc.
I have previously implemented several projects with RFID modules (RC522 as an example) that send the tag ID through a network for access control applications and attendant systems. I had no trouble sending the tag ID to a PHP script as a parameter in the URL (GET request).
Some details would need to be discussed, about the handling of the display and "warning speaker", but I will have no trouble implementing your project.
If you are interested in my bid, please let me know some more details about your project and feel free to contact me.
Regards,
Carlos.