Kelly Bayer Rosmarin has been under pressure to quit after overseeing a tumultuous period for the firm.
The chief executive of Australian telecom giant Optus has resigned after a nationwide outage this month.
Kelly Bayer Rosmarin has been under pressure to quit after overseeing a tumultuous three years for the firm.
Along with the network failure which left almost half of Australia disconnected, she was at the helm during a major data breach last year.
