Stamping of additional employees on the smartphone/tablet via NFC chip

It would be practical if, when many employees are clocking in at the start/end of their break/work, the clocking in could be simplified by an NFC chip, similar to the stationary terminals, select times or end of work and have the NFC chip read out on the smartphone. Because if many employees stamp different breaks, the "man" on the smartphone is only busy stamping.