Lead Mechanical Commissioning (Cx) Engineer - Data Center Lead the Systems That Keep Critical Infrastructure Running At FST Technical Services, we ensure the most complex facilities operate exactly as intended. Our Commissioning division partners with clients across data centers and mission-critical environments to validate that systems are designed, installed, and performing at the highest level. We are seeking a Senior Mechanical Project Engineer who brings deep technical expertise, field leadership, and the ability to drive outcomes in high-performance environments. Why This Role Stands Out This is a position for someone who: • Owns system performance from design through execution • Understands how complex mechanical systems operate as a whole • Can identify and solve issues before they impact operations You will work on large-scale, mission-critical data center projects where performance, reliability, and precision are non-negotiable. What You will Do Project Leadership & Execution • Lead commissioning activities across the full lifecycle of a data center build to include L1-L5 • Execute functional testing, witness testing, and system validation • Manage assignments within schedule, budget, and quality expectations Technical Expertise & Problem Solving • Evaluate HVAC, chillers, boilers, pumps, and automation systems • Troubleshoot system performance issues • Review design documentation Client Engagement • Lead meetings and communicate findings • Build relationships with clients and contractors Operational Contributions • Complete reports and manage time and expenses Team Development • Mentor junior engineers and support training What You Bring Core Qualifications • Degree in HVACR, Mechanical, Electrical Engineering or related field • 5+ years experience in commissioning engineering • 3+ years of Data center experience required Technical Capabilities • Experience with HVAC, controls, automation, fire safety systems • Ability to read construction documents Professional Skills • Strong communication and problem-solving skills Physical Requirements • Ability to work in field environments and lift 30 lbs Preferred • EIT, CEM, OSHA 30, BIM experience, Facility Grid Travel Requirements Travel to project sites as needed based on project demands. Why FST At FST, we value execution, accountability, and expertise. Engineers have opportunities to gain experience into leadership roles and work on complex, high-impact projects. Important Notes No visa sponsorship available. Candidates must be authorized to work in the United States. Base Salary: $130,000 to $150,000 depending on experience, comprehensive benefits, monthly per diem and mobilization support