About the Job

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HVAC & Mechanical Design Intern — Path to Full-Time

ARCO National Holdings

Richmond Heights, Missouri, United States

22 October 2026

ARCO National Holdings is seeking a Mechanical Engineer Intern for our St. Louis area team (Richmond Heights). You will assist with HVAC and mechanical systems design from concept through construction, working with a collaborative group of engineers to solve real-world problems. The ideal candidate is proactive, with strong communication skills, pursuing a Civil or Mechanical degree and a minimum 3.0 GPA, and a desire to learn through hands-on projects and mentorship. #J-18808-Ljbffr