INTERNSHIP DETAILS

Mechanical Engineer Intern

CompanyARCO National Holdings
LocationRichmond Heights
Work ModeOn Site
PostedOctober 16, 2026
Internship Information
Core Responsibilities
Assist with the design and engineering of HVAC and mechanical systems from concept through construction. Participate in jobsite visits and engage in professional training programs.
Internship Type
full time
Company Size
198
Visa Sponsorship
No
Language
English
Working Hours
40 hours
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About The Company
ARCO's goal is the same today as it was when we founded the company 30 years ago – to be the best design-build contractor in the industry and to serve our clients with expert skill and high integrity. We make the construction process enjoyable and beneficial for our associates and customers. Our first core value is to "treat people fairly and do the right thing." We are committed to building and sustaining a culture that supports diversity and inclusion. From recruiting, training, and hiring practices, to the selection of our subcontractors, we understand that the diversity of all those involved in the construction process enhances our ability to deliver the best solutions to our customers.
About the Role

ABOUT YOU

We are looking for a Mechanical Engineer Intern to join our growing team in St. Louis (Richmond Heights). You will assist with 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. 

A DAY IN THE LIFE

At ARCO, we are committed to taking care of our greatest asset – our team. ARCO’s best-in-class benefits and superior compensation are what set us apart from the competition and continue to attract top industry talent. 

  • Competitive hourly rate (with overtime possible)  
  • Housing stipend (based on need)  
  • Internship hours count towards our ESOP eligibility 
  • End-of-term performance bonus based on merit 
  • Path to full time position  
  • Sign-on bonus for each term served if hired as a full-time associate following graduation 
  • Direct access to leaders 
  • Intern training program to learn real world skills 
  • 2 formal reviews during your Internship to enhance learning opportunities 
  • Traveling to jobsites 
  • Engagement events 

NECESSARY QUALIFICATIONS

  • Enrolled in Civil or Mechanical Bachelor’s degree program 
  • Minimum Grade Point Average of 3.0 out of 4.0 
  • Previous Internship or Co-op construction experience preferred 
  • Excellent verbal and written communication skills and a strong work ethic 

WHAT WE CAN OFFER YOU

At ARCO, we are committed to taking care of our greatest asset – our team. ARCO’s best-in-class benefits and superior compensation are what set us apart from the competition and continue to attract top industry talent. 

  • Competitive hourly rate (with overtime possible)  
  • Housing stipend (based on need)  
  • Internship hours count towards our ESOP eligibility 
  • End-of-term performance bonus based on merit 
  • Path to full time position  
  • Sign-on bonus for each term served if hired as a full-time associate following graduation 
  • Direct access to leaders 
  • Intern training program to learn real world skills 
  • 2 formal reviews during your Internship to enhance learning opportunities 
  • Traveling to jobsites 
  • Engagement events 

 

MAKE YOUR MOVE

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.

LEGAL DISCLAIMER

EOE, including disability/vets

Key Skills
Mechanical engineeringHVAC designProblem solvingConstruction engineeringVerbal communicationWritten communicationWork ethicTechnical knowledge
Categories
EngineeringConstruction
Benefits
Competitive hourly rateHousing stipendESOP eligibilityPerformance bonusSign-on bonusIntern training programEngagement events