Core Government Services (CGS) company is seeking an experienced Senior HVAC / Mechanical Systems Technician to maintain and optimize the thermal management and mechanical systems supporting the VA Capital Region Readiness Center (CRRC) in Martinsburg, WV.The Senior HVAC Technician will be responsible for preventive maintenance, emergency troubleshooting, overhaul, and repair of critical data center cooling systems, including central chillers, dry coolers, Computer Room Air Handler (CRAH) units, chilled water pumping systems, glycol loops, and rooftop air handling units. Minimum five (5) years of commercial or mission-critical HVAC experience supporting facilities comparable in size and complexity to the CRRC.Proven experience troubleshooting and maintaining centrifugal/screw chillers, chilled water piping circuits, and close-tolerance computer room air conditioning systems.