Advanced understanding of mechanical and electrical equipment, systems, and design for data centers, including MV/LV distribution, transformers, switchgear, UPS, STS/ATS, PDUs, VFDs, generators, chillers (air- and water-cooled), pumps, cooling towers, heat exchangers, CRAHs, air economizers, and liquid cooling. Support factory witness testing and on-site commissioning from an operations and maintainability perspective: witness equipment testing, validate sequences of operation, and confirm receipt of complete operational documentation at turnover.