PwC has been criticised for developing a facial recognition tool to monitor staff working from home. There is concern that the tool invades employees right to privacy.
The Big 4 firms is reportedly in talking with other financial companies about using the technology, which can monitor how many breaks staff take.
The software, which uses computer webcams, will also ensures that staff are adhering to company rules, and are not involved in anything such as insider trading.
The story, which broke in Financial News, revealed that workers would be required to provide a written explanation for screen absences ranging from a few seconds to 10 minutes or more.