Lead Mechanical Commissioning Engineer
Listed on 2026-09-22
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Engineering
Mechanical Engineer, Systems Engineer
Lead Mechanical Commissioning Engineer – Data Centers
Industry: Mission Critical / Data Center Commissioning
Location
: US Nationwide
Salary: $170,000–$195,000
Base Salary + OT Bonus + Per Diem
X4 Engineering are proud to be partnering with a leading commissioning and operational readiness specialist supporting hyperscale and mission-critical data center programmes for some of the largest owners and operators in the country.
As part of the continued growth of their commissioning business, they're looking to hire a Lead Mechanical Commissioning Engineer to act as the mechanical technical authority across mission-critical data center projects nationwide.
This is a highly visible role where you'll lead Functional Performance Testing and support Integrated Systems Testing across cooling and heat rejection systems, validating redundancy and failure-mode performance on live, schedule-critical builds.
Working closely with EPC teams, controls and electrical commissioning leads, and site operations, you'll play a key role in delivering high-stakes testing programmes across chilled water, DX, evaporative, and liquid cooling systems, CRAH/CRAC plant, pumps, valves, and heat exchangers.
This role requires extensive travel to support live commissioning programmes across sites nationwide.
Key Requirements:
- Willingness and ability to travel approximately 75% of the time to active project sites nationwide.
- 10+ years of experience in mission-critical or high-reliability mechanical systems, with demonstrated leadership of mechanical commissioning on large data center projects.
- Deep knowledge of mission-critical cooling systems, including chilled water, DX, evaporative, and liquid cooling.
- Expertise across CRAH/CRAC systems, pumps, valves, heat exchangers, and heat rejection equipment.
- Strong understanding of mechanical sequences, controls integration, and sensor strategy.
- Hyperscale or large colocation data center background.
- Prior experience as a Senior Mechanical Commissioning Engineer or equivalent.
- Certified Commissioning Professional (CCP), Professional Engineer (PE), or OSHA 30-Hour Construction Safety certification.
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