Mechanical Design Engineer

About You

We are looking for a HVAC Engineer to join our growing team in St. Louis (Richmond Heights). You will be responsible for the design and engineering of HVAC and mechanical systems from concept through construction. The ideal candidate is a proactive problem solver who thrives in a collaborative environment and brings both technical knowledge and a practical mindset to each project.

We are looking for a HVAC Engineer to join our growing team in St. Louis (Richmond Heights). You will be responsible for the design and engineering of HVAC and mechanical systems from concept through construction. The ideal candidate is a proactive problem solver who thrives in a collaborative environment and brings both technical knowledge and a practical mindset to each project.

• Design HVAC and mechanical systems for commercial and industrial buildings
• Prepare drawings, specifications, and equipment schedules in Revit and AutoCAD
• Perform load calculations, equipment selection, and ductwork layouts
• Coordinate with architects, structural engineers, clients, and subcontractors to integrate MEP systems into overall building design
• Attend design meetings and construction coordination sessions as needed
• Assist with code compliance reviews and permitting documentation
• Manage multiple deadlines and adapt to evolving project scopes

• Bachelor's degree in Mechanical Engineering or related field
• 3-8+ years of mechanical design experience in commercial or industrial sectors
• Design-build project delivery experience is highly preferred
• Proficiency in Revit, AutoCAD, and mechanical load calculation tools (e.g., Trane Trace, HAP)
• Strong knowledge of IMC, ASHRAE standards, and relevant energy codes (e.g., Title 24, IECC)

We are committed to taking care of our greatest asset – our team. Our best‑in‑class benefits and superior compensation are what set us apart from the competition and continue to attract top industry talent.

• Industry‑leading performance‑based bonus program
• 100% employer‑funded ESOP to all associates
• Traditional and Roth 401k
• Tuition reimbursement for associates
• Scholarship for associates’ children up to $28,000 per child
• 1-month paid sabbatical after every five years of employment, plus $5,000 for travel
• 1-week paid volunteer leave each year & 100% charitable match
• Medical, dental, and vision insurance coverage
• 3 weeks of vacation
• 100% paid 12-week maternity leave

We are proud to be one of the fastest‑growing, privately‑owned companies in America, celebrating over 30 years of experience as design‑build experts. We have completed over 7,500 design‑build projects nationwide. We ranked #9 on ENR’s Design‑Build Firms list and #34 on ENR's Top 400 Contractors list of 2026. Most importantly, our clients like us, trust us, and want to do business with us.

We are looking for people with the same enthusiasm, passion, and respect for the hard work that brought us to where we are today. Are you a person who can make a difference at ARCO? If the answer is “Yes!” we look forward to meeting you.

ARCO does not accept unsolicited resumes from individual recruiters or third-party recruiting agencies without pre-approval from ARCO’s Human Resources team. Pre‑approval is required before any external candidate can be submitted. ARCO will not be responsible for fees related to unsolicited resumes and for candidates who are sent directly to our hiring managers. Agencies must have a fully executed vendor agreement in place as well as written approval to submit candidates from an ARCO TA Manager for a specific position before submitting candidates.

EOE, including disability/vets