Jr & Sr Mechanical Design Engineer

gpac; St. Louis (MO); On-site; USD 75,000 - 110,000; Full time

Benefits offered by this job

Health insurance

401(k) plan

Profit sharing

Competitive pay

PTO

Job summary

gpac is seeking a Mechanical Design Engineer specializing in HVAC and building systems for commercial and institutional facilities. You will design airside and waterside HVAC components, work with owners, architects, and construction teams, and ensure designs comply with codes and industry standards.

This role emphasizes collaboration across design, preconstruction, estimating, and field teams to deliver complex systems from concept through completion.

Qualifications

• 2+ years of experience in facilities or mechanical systems design
• Experience with healthcare, higher education, commercial, laboratory facilities
• Knowledge of building codes and mechanical design standards
• Proficiency with Revit and AutoCAD
• Understanding of HVAC systems and equipment

Responsibilities

• Develop mechanical designs for commercial and institutional facilities
• Design HVAC airside and waterside systems
• Coordinate with architects, owners, construction teams
• Review vendor drawings and equipment submittals
• Ensure designs meet codes and safety standards
• Assist with design-build project planning and estimates
• Maintain CAD/BIM standards and client presentations

Skills

HVAC design

Revit

AutoCAD

Mechanical systems

Project coordination

Education

Bachelor's degree in Mechanical Engineering

EIT certification (plus)

Tools

Trane TRACE 700

Carrier HAP

Job description

Mechanical Design Engineer - HVAC / Building Systems

We are seeking a talented Mechanical Design Engineer to join a well-established and highly respected organization with a long history of delivering complex commercial and institutional projects.

This is an excellent opportunity for someone with a strong foundation in HVAC and mechanical systems design who enjoys collaborating with owners, architects, construction teams, and other engineering disciplines. You'll have the opportunity to work on diverse, technically challenging projects while continuing to grow your design and construction expertise.

What You'll Be Doing

• Develop mechanical designs for a variety of commercial and institutional facilities
• Research, review, and establish project-specific design criteria
• Design and size HVAC airside and waterside systems
• Assist with the design and layout of medical/laboratory gas and process systems
• Define system requirements and select equipment for design-build projects
• Generate plans and coordinate mechanical designs with architectural and other trades
• Perform industry calculations and simulations utilizing programs such as Trane TRACE 700 and Carrier HAP
• Work directly with building owners, property managers, architects, engineers, and construction teams
• Ensure designs comply with applicable building codes, safety requirements, and industry standards
• Assist Estimating and Preconstruction teams with technical information for construction proposals
• Review and process vendor shop drawings and equipment submittals
• Support the development and maintenance of CAD/BIM standards, details, and best practices
• Professionally present technical issues and design solutions to clients
• Manage responsibilities across multiple projects while maintaining schedules and quality standards

Qualifications

• 2+ years of experience in facilities or mechanical systems design, or equivalent experience
• Experience with projects in markets such as healthcare, higher education, commercial, laboratory, industrial, or similar facilities
• Working knowledge of building codes and mechanical design standards
• Proficiency with Revit and AutoCAD
• Basic to intermediate knowledge of mechanical equipment and HVAC systems
• Strong organizational, technical, written, and verbal communication skills
• Ability to prioritize and manage responsibilities across multiple projects
• Self-starter who works well in a collaborative environment and enjoys solving technical challenges

Additional Preferred Qualifications

• Bachelor's degree in Mechanical Engineering or a related technical discipline
• EIT certification is a plus
• Previous construction or design-build experience is highly desirable
• Experience with Trane TRACE 700, Carrier HAP, or similar load-calculation/design software
• Exposure to medical gas, laboratory, process piping, or complex mechanical systems is a plus

Projects May Include

• Commercial
• Healthcare
• Higher Education
• Bio-Pharmaceutical
• Laboratories & Clean Spaces
• Food & Beverage
• Light Industrial
• Manufacturing
• Heavy Mechanical Retrofit

What's In It For You

Join an organization with a reputation built on long‑term relationships, technical expertise, and quality work.

• Competitive compensation
• Excellent health and life insurance
• Robust benefits package
• 401(k)
• Profit sharing
• Comprehensive wellness program
• Highly competitive PTO program
• Collaborative, family‑friendly work environment
• Diverse and technically challenging projects
• Opportunities for continued professional and technical growth
• Long‑term stability with an established organization

This is an excellent opportunity for a Mechanical Engineer or Designer who wants to be involved in more than simply producing drawings-you'll have the opportunity to collaborate across design, preconstruction, estimating, and construction while helping deliver complex building systems from concept through completion.

I intentionally leaned into Revit, HVAC, design‑build, mechanical systems, and complex facilities so it should attract candidates with actual MEP design experience rather than general mechanical engineers.

All qualified applicants will receive consideration without regard to race, age, color, sex (including pregnancy), religion, national origin, disability, sexual orientation, gender identity, marital status, military status, genetic information, or any other status protected by applicable laws or regulations.