Design-Build HVAC Engineer – Field-Driven MEP Design

gpac LLC.; 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

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,