BMS Commissioning Technicians validate building management systems by testing HVAC, lighting, and control integrations using BMS software, sensors, PLCs, and control panels. They perform functional testing, calibration, and troubleshooting to ensure systems operate as designed. Responsibilities include system verification, documentation, fault resolution, and coordination with installation teams. Work environments include commercial buildings, smart facilities, and project sites. They follow commissioning standards and safety protocols. Their role ensures system reliability, energy efficiency, and proper system handover, making them essential in modern building automation projects globally.