Mechanical Engineer - HVAC / Design Build

gpac; St. Louis (MO); On-site; USD 70,000 - 100,000; Full time

Benefits offered by this job

401(k) with profit sharing

Health and life insurance

Wellness program

Generous paid time off

Professional development

Exposure to diverse projects

Collaborative work environment

Strong project backlog

Job summary

gpac LLC. is seeking a Mechanical Engineer/Designer to design HVAC systems for commercial, healthcare, and industrial facilities in the St. Louis area.

You will collaborate with estimating and construction teams on design-build and design-assist projects, shaping equipment selections and system layouts through field-ready documentation. Responsibilities include load calculations, Revit/AutoCAD modeling, and ensuring compliance with codes, with opportunities for professional growth in a stable,

Qualifications

• 2+ years of mechanical engineering or HVAC design experience.
• Experience designing mechanical systems for commercial, healthcare, higher education, or similar facilities.
• Working knowledge of HVAC equipment, system design, and applicable building codes.
• Proficiency in Revit and AutoCAD.
• Familiarity with HVAC load calculation software such as Trane TRACE or Carrier HAP.
• Ability to manage multiple projects and coordinate with different teams.
• Strong communication, organizational, and problem-solving skills.
• Interest in working closely with construction teams and seeing designs implemented in the field.

Responsibilities

• Design HVAC systems for commercial, institutional, and industrial projects, including airside and waterside systems.
• Perform heating and cooling load calculations using Trane TRACE, Carrier HAP, or similar software.
• Assist in developing design criteria, system requirements, and equipment selections.
• Prepare mechanical drawings and models using Revit and AutoCAD.
• Support design-build and design-assist projects from conceptual design through construction.
• Coordinate mechanical designs with architects, engineers, contractors, and other trades.
• Work with estimating and preconstruction teams on project proposals, budgets, and technical solutions.
• Assist with specialty system design, including medical/lab gases and process piping layouts.
• Prepare and review equipment submittals and shop drawings.
• Ensure designs comply with applicable building codes and safety standards.
• Communicate with owners, architects, and construction teams to resolve technical issues.
• Maintain accurate project documentation and support CAD/BIM standards.

Skills

HVAC design

Project coordination

Revit

AutoCAD

Load calculations

Education

Bachelor's degree in Mechanical Engineering

Engineer in Training (EIT) certification

Tools

Revit

AutoCAD

Trane TRACE

Carrier HAP

Job description

Location: St. Louis, MO | Full-Time, In-Office

Industry: Mechanical Construction | HVAC | MEP Engineering

Job Description

Are you a Mechanical Engineer or Designer who wants to see your designs come to life in the field? A well-established mechanical contractor in the St. Louis area is adding to its in-house engineering team.

This is an opportunity to work directly with estimating, preconstruction, and construction teams on design-build and design-assist projects. You'll be involved in designing mechanical systems, selecting equipment, solving technical challenges, and seeing projects through construction.

Projects span commercial, healthcare, higher education, laboratories, manufacturing, and industrial facilities.

What We Offer

• Competitive salary based on experience
• 401(k) with profit sharing
• Health and life insurance, plus a wellness program
• Generous paid time off
• Opportunities for professional development and career growth
• Exposure to a variety of commercial and industrial mechanical projects
• Collaborative environment where engineering and construction teams work closely together
• Stable, established company with a strong project backlog

Key Responsibilities

• Design HVAC systems for commercial, institutional, and industrial projects, including airside and waterside systems
• Perform heating and cooling load calculations using Trane TRACE, Carrier HAP, or similar software
• Assist in developing design criteria, system requirements, and equipment selections
• Prepare mechanical drawings and models using Revit and AutoCAD
• Support design-build and design-assist projects from conceptual design through construction
• Coordinate mechanical designs with architects, engineers, contractors, and other trades
• Work with estimating and preconstruction teams on project proposals, budgets, and technical solutions
• Assist with specialty system design, including medical/lab gases and process piping layouts
• Prepare and review equipment submittals and shop drawings
• Ensure designs comply with applicable building codes and safety standards
• Communicate with owners, architects, and construction teams to resolve technical issues
• Maintain accurate project documentation and support CAD/BIM standards

Qualifications

• 2+ years of mechanical engineering or HVAC design experience
• Experience designing mechanical systems for commercial, healthcare, higher education, or similar facilities
• Working knowledge of HVAC equipment, system design, and applicable building codes
• Proficiency in Revit and AutoCAD
• Familiarity with HVAC load calculation software such as Trane TRACE or Carrier HAP
• Ability to manage multiple projects and coordinate with different teams
• Strong communication, organizational, and problem-solving skills
• Interest in working closely with construction teams and seeing designs implemented in the field

Preferred Qualifications

• Bachelor's degree in Mechanical Engineering or a related technical field
• Engineer in Training (EIT) certification
• Previous mechanical construction or design-build experience
• Experience with hydronic systems, process piping, or specialized HVAC applications

Work Arrangement

Full-time, in-office position in the St. Louis area.

Related Titles: Mechanical Engineer, HVAC Engineer, Mechanical Design Engineer, HVAC Design Engineer, MEP Engineer, Mechanical Designer, HVAC Mechanical Designer, Design Build Engineer, Building Systems Engineer, Mechanical EIT, HVAC Project Engineer, Facilities Mechanical Engineer

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.