On-Site Mechanical Engineer – Critical Infra & Commissioning

Jacobs; St. Louis (MO); On-site; USD 95,200 - 130,900; Full time

Benefits offered by this job

Medical insurance

401(k) plan

Stock purchase option

PPTO

Job summary

Jacobs is seeking an On-Site Mechanical Engineer for a project near Baton Rouge, LA. This role serves as the field representative for mechanical systems, coordinating between construction and design teams to ensure installation, testing, and commissioning progress smoothly.

The candidate will oversee HVAC, cooling, piping, and other mechanical aspects, conduct daily site observations, and lead design clarifications while supporting RFIs, submittals, and field coordination with multiple trades.

Qualifications

• Bachelor's degree in Mechanical Engineering or related discipline.
• 10+ years of mechanical design, construction, commissioning, or operations experience; or 5+ years in hyperscale data center environments.
• Experience with chilled water systems, cooling plants, CRAH/CRAC systems, piping systems, and mission-critical environments.
• Strong understanding of specifications, codes, and industry standards.
• Ability to evaluate field conditions and provide practical solutions.
• Excellent communication and coordination skills.

Responsibilities

• Serve as the primary on-site representative for HVAC, cooling, piping, plumbing, and other mechanical systems.
• Perform daily site observations and assess installation progress and workmanship.
• Coordinate mechanical design clarifications and field solutions with project stakeholders.
• Facilitate responses to RFIs, submittals, equipment substitutions, and field conflicts.
• Support reviews of equipment layouts, utility routing, and coordination between trades.
• Participate in constructability reviews, BIM coordination activities, and mockup evaluations.
• Identify and document mechanical installation deficiencies and opportunities for improvement.
• Support factory testing, bench testing, startup activities, and commissioning preparation.
• Coordinate with QA/QC and commissioning teams to resolve installation issues.
• Attend project meetings and provide technical guidance on mechanical systems.
• Issue weekly reports summarizing observations, risks, corrective actions, and schedule impacts.
• Proactively identify design, quality, and schedule risks and support resolution strategies.

Skills

Mechanical design

Construction coordination

Field observations

Communication

Problem solving

Hyperscale data centers

HVAC systems

Education

Bachelor's degree in Mechanical Engineering

Tools

BIM coordination

HVAC design tools

Job description

Jacobs is seeking an On-Site Mechanical Engineer for a project near Baton Rouge, LA. This role serves as the field representative for mechanical systems, coordinating between construction and design teams to ensure installation, testing, and commissioning progress smoothly.

The candidate will oversee HVAC, cooling, piping, and other mechanical aspects, conduct daily site observations, and lead design clarifications while supporting RFIs, submittals, and field coordination with multiple trades.