Abstract: The present invention pertains to a system that can conduct building facade operations with an end effector. The robot system can include an end effector and a carrier platform. The end effector can travel to a position along a building facade to conduct the required tasks such as inspection or marking. The carrier platform can include a mobile chassis, a cable actuating mechanism, a cable routing system, and a fall protection system. The mobile chassis can move the carrier platform along a roof of a building or other site. The cable routing system together with the cable actuating mechanism can drive positioning and extension of the end effector. The coordinated motion of the mobile chassis and the cable actuating mechanism can enable adaption to the building geometries and features. A fall protection system can be incorporated to ensure the safety of the end effector.