The Senior HVAC Technician works closely with Controls, Chiller, Electrical, and site operations teams and serves as a subject-matter expert for HVAC-related activities, including troubleshooting, planned maintenance, system optimization, and incident response. Perform advanced preventive, predictive, and corrective maintenance on HVAC systems, including CRAH/CRAC units, AHUs, fan systems, pumps, chillers at a support level, VFDs, humidification systems, and associated mechanical equipment.