Mechanical Engineer III

CRB · St. Louis, Missouri, United States

Location

St. Louis

Job Type

Full-time

Posted

June 04, 2026

Job Description

Job Description
As a Mechanical Engineer III, you’ll play a key role in designing mechanical systems for complex facilities while also taking ownership of project scope and mentoring junior team members. This is a great opportunity for an engineer who wants to grow into leadership while staying hands-on with design.
You’ll contribute across the full project lifecycle—from early concept through construction—working alongside a multidisciplinary team to deliver high-quality, coordinated solutions.
Core Responsibilities
Design & Engineering
Design HVAC and mechanical utility systems for new construction, renovations, and process-driven environments
Perform engineering calculations, including heating/cooling loads, energy modeling, and system sizing
Develop construction documents, including drawings, P&IDs, specifications, and system layouts
Select and specify equipment and ensure designs align with appli...
        

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