Mechanical Commissioning Engineer

Overwatch Mission Critical•Remote,

About The Position

The Mechanical Commissioning Engineer assists with the mechanical validation program for large-scale, mission-critical data center construction projects. The role leads the QA/QC process across Levels 2 through 3 (L2–L3) and assists with end-to-end commissioning across Levels 4 through 5 (L4–L5). The successful candidate provides technical oversight to field technicians and trade contractors, bridging design requirements and field conditions to validate HVAC, cooling, and automation systems under realistic failure scenarios. The role covers L2–L3 documentation verification, installation and construction-readiness checks, and equipment and vendor startup validation. It also assists with L4 functional performance testing and L5 integrated systems testing, including heat-load tests of redundancy, interlocks, failovers, and transient behaviors. The engineer reviews site-specific test scripts, Method Statements (MOPs), and pre-functional checklists, and contributes to tracking and remediation of mechanical deficiencies. Relevant systems include chilled water systems; air handling and computer-room cooling systems; advanced liquid cooling infrastructure; building automation and controls; and supporting fuel oil, fire suppression, and plumbing systems. The position is deployment-site focused and may require travel 50% to 65% of the time.

Requirements

Bachelor’s degree in Mechanical Engineering, HVACR, Construction Management, or equivalent technical field experience.
At least 1 year of direct mechanical commissioning, engineering, or mission-critical facilities construction experience.
Experience leading L2–L3 programs on hyperscale, colocation, or enterprise builds.
Ability to navigate construction sites, climb ladders, and lift up to 30 lbs.
Willingness and ability to travel 50% to 65% of the time.

Responsibilities

Lead L2 documentation verification, on-site installation and construction-readiness checks, and L3 equipment startup and vendor startup validation.
Assist with Level 4 functional performance testing, including sequence-of-operations validation on mechanical systems.
Assist with Level 5 integrated systems testing, including heat-load testing to validate redundancy, interlocks, failovers, and transient behaviors.
Review site-specific test scripts, Method Statements (MOPs), and pre-functional checklists.
Contribute to the project issue log by categorizing mechanical discrepancies by risk and tracking vendor remediation.
Provide technical oversight to field technicians and trade contractors.
Validate installation, tuning, and failure modes of chilled water, air handling, liquid cooling, controls and automation, and support infrastructure systems.