Mechanical Engineer III

CRB; St. Louis (MO); On-site; USD 85,000 - 120,000; Full time

Job summary

CRB is seeking a Mechanical Engineer III to design mechanical systems for complex facilities and take ownership of project scope while mentoring junior team members.

You will contribute across the full project lifecycle—from concept through construction—working with a multidisciplinary team to deliver high-quality, coordinated designs. A PE license and ABET-accredited degree are required, with 5+ years in mechanical design and BIM proficiency.

Qualifications

• Bachelor's degree in Mechanical or Architectural Engineering (ABET-accredited).
• 5+ years of professional experience in mechanical system design (AEC environment preferred).
• Professional Engineer (PE) license required.
• Experience designing HVAC and mechanical systems for commercial or industrial facilities.
• Strong understanding of engineering fundamentals, codes, and industry standards.

Responsibilities

• Design HVAC and mechanical utility systems for new construction, renovations, and process-driven environments.
• Lead the mechanical scope for small to mid-sized projects or major portions of larger projects.
• Manage deadlines, deliverables, and mechanical budgets for assigned work.
• Contribute to all phases of design, including conceptual, schematic, design development, and construction.
• Mentor and support the development of junior engineers and designers.

Skills

PE license

HVAC design

Codes & standards

Education

ABET-accredited Bachelor's in Mechanical or Architectural Engineering

Tools

Revit

AutoCAD

BIM tools

Job description

CRB is a leading provider of sustainable engineering, architecture, construction and consulting solutions to the global life sciences and food and beverage industries. Our more than 1,100 employees provide best-in-class solutions that drive success and positive change for our clients, our people and our communities. CRB is a privately held company with a rich history of serving clients throughout the world, consistently striving for the highest standard of technical knowledge, creativity and execution.

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 applicable codes and standards (ASHRAE, NFPA, etc.)

Project Ownership

• Lead the mechanical scope for small to mid-sized projects or major portions of larger projects
• Manage deadlines, deliverables, and mechanical budgets for assigned work
• Contribute to all phases of design, including conceptual, schematic, design development, and construction

Collaboration & Coordination

• Partner closely with architects, engineers, contractors, and clients to deliver coordinated designs
• Participate in site visits, field surveys, and construction support activities (RFIs, submittals, punch lists)
• Ensure designs are practical, constructible, and aligned with project goals

Team & Quality Leadership

• Mentor and support the development of junior engineers and designers
• Lead quality checks and ensure deliverables meet CRB standards
• Contribute to continuous improvement and internal knowledge sharing

Qualifications

Minimum Qualifications

• Bachelor's degree in Mechanical or Architectural Engineering (ABET-accredited)
• 5+ years of professional experience in mechanical system design (AEC environment preferred)
• Professional Engineer (PE) license
• Experience designing HVAC and mechanical systems for commercial or industrial facilities
• Strong understanding of engineering fundamentals, codes, and industry standards

Preferred Qualifications

• Experience in life sciences, pharmaceutical, biotech, laboratory, or food & beverage facilities
• Familiarity with GMP environments or regulated industries
• Proficiency with Revit, AutoCAD, and BIM tools
• Experience working with contractors, vendors, and multidisciplinary teams
• Exposure to sustainable design practices (LEED, WELL, etc.)
• Experience with plumbing systems and/or field assessments

Additional Information

All your information will be kept confidential according to EEO guidelines.

CRB is committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity Employer and it is our policy to provide equal opportunity to all people without regard to race, color, religion, national origin, ancestry, marital status, veteran status, age, disability, pregnancy, genetic information, citizenship status, sex, sexual orientation, gender identity or any other legally protected category. Employment is contingent on background screening.

CRB does not accept unsolicited resumes from search firms or agencies. Any resume submitted to any employee of CRB without a prior written search agreement will be considered unsolicited and the property of CRB. Please, no phone calls or emails.

CRB offers a complete and competitive benefit package designed to meet individual and family needs.

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.