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JLL Logo JLL · Construction

Mep commissioning engineer

United States, St. Louis · Job Posted February 20, 2026
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Job Description

JLL is seeking a Commissioning Engineer to provide reliable, efficient support to our Commissioning & Building Analytics (CBA) team. You'll work with diverse internal and external stakeholders while exercising independent judgment to manage multiple priorities in a fast-paced environment. The ideal candidate will be detail-oriented with strong organizational skills and a collaborative mindset, directly supporting JLL's commitment to delivering high-quality commissioning services that ensure optimal building performance.

Job Responsibility

  • Execute commissioning processes according to ASHRAE, CSA, and LEED requirements
  • Conduct inspections and testing of mechanical, plumbing, electrical, fire protection, and control systems
  • Manage commissioning projects through design, pre-construction, construction, and post-construction phases
  • Develop comprehensive commissioning plans, specifications, and test scripts
  • Perform field-based activities including site visits and directing functional tests
  • Review design drawings, specifications, and submittals for commissioning compliance
  • Lead commissioning meetings and maintain detailed issue logs

Requirements

  • University technical degree (Engineering degree preferred)
  • LEED AP certification
  • Minimum 10 years of relevant mechanical engineering/field-testing experience
  • Minimum 5 years in building commissioning
  • Experience with mechanical testing equipment and data analysis
  • Knowledge of HVAC&R systems, building management systems, and fire protection
  • Proficiency in MS Project, Word, and Excel

Nice to have

  • Professional Engineer/PE or PMP designation
  • CEM, CBCP, and/or CPMP designations
  • Master Mechanic License
  • Experience with electrical testing equipment
  • Background in consultancy or owner organization
  • Facility Management experience
  • Operating engineer experience in data centers or mission-critical facilities

What we offer

  • 401(k) plan with matching company contributions
  • Comprehensive Medical, Dental & Vision Care
  • Paid parental leave at 100% of salary
  • Paid Time Off and Company Holidays
  • Early access to earned wages through Daily Pay
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