A method and system for dynamically testing a networked target system (NTS) through simulation by a mobile device. The method comprises: receiving at least one test specification designating at least a type of the test and a number of step repeater devices (SRDs) required for the test; receiving, from the mobile device, a request to establish a secure connection; establishing the secure connection with the mobile device by impersonating the NTS; capturing each step performed by a user of the mobile device on an application installed thereon, wherein the application operates in conjunction with the NTS; setting all SRDs designated in the test specification with each captured step, thereby causing the SRDs to perform the captured step; receiving, from the SRDs, information respective of performance of the NTS; and generating a performance testing report based on the received information.