Building Systems Commissioning Technicians test and validate integrated building systems such as HVAC, electrical distribution, plumbing, and fire safety systems. They use diagnostic tools, testing equipment, and control systems to ensure systems meet design specifications. Responsibilities include inspection, functional testing, troubleshooting, and documentation. Work environments include construction sites and commercial facilities. They follow commissioning standards and safety protocols. Their role ensures system readiness, operational efficiency, and compliance, making them critical in building construction and facility management globally.