Mechanical Engineer Intern - Summer 2026

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Chesterfield, MO, USA
In-Office
Software • Design
The Role

TITLE: Mechanical Engineer Intern

OVERVIEW: The Mechanical Engineer Intern provides knowledge and support in a variety of areas including:

  • Being an entry level Mechanical Engineer, adhering to company, department, and client standards and procedures, and having a general understanding of required mechanical design drafting.
  • Following procedures and collaborating to prepare design deliverables that meet project requirements under general supervision of Senior Mechanical Engineers.
  • Using data from structural and electrical disciplines, as well as client and vendor information sources to prepare mechanical design.
  • Performing, with guidance, mechanical calculations, flow sheet and P&ID development, plant equipment and systems design, specifications, equipment bid packages, piping and related equipment design, duct and chute design, and HVAC system design.
  • Developing knowledge of mechanical materials, construction methods, and applicable building codes, including but not limited to ASME, Industrial Ventilation Guidelines, and CEMA Standards.

SPECIFIC DUTIES:   

  •  Work on 1-2 project designs simultaneously and meet strict deadlines.
  • Actively participate and contribute to project and interdepartmental meetings to facilitate successful completion of projects and to meet customer expectations and needs.
  •  Strive to increase efficiency in all aspects of mechanical design.
  • Understand and apply concerns of safety, maintenance, accessibility, constructability, and coordination.
  • Register point clouds.
  • Develop flow sheets.
  • Assist in preparation of construction documents and design deliverables.
  • Size mechanical equipment with direction.
  • Create and modify 3D models for design work.
  • Issue and record drawing submittals and revisions, and Requests for Information, with guidance.
  • Identify, communicate, and explore solutions to design challenges, conflicts, and clashes.
  • Be capable of developing proficiency in the use of Revit and AutoCAD.
  • Have or be able to effectively develop knowledge in the use of Excel, Belt Analyst, Pipeflo, and other calculation software
  • Develop an understanding of equipment best practices.
  • Develop basic knowledge of structural design and equipment support practices.
  • Assist in material take-offs for development of construction quantity estimates.
  • Perform vendor drawing coordination to ensure design intent is met.

     QUALIFICATIONS:

    •  Current enrollment in Bachelor of Science in Engineering program (Mechanical preferred).
    • Excellent communication skills with an understanding of teamwork and the requisite ability to coordinate work with internal and external project stakeholders.
    • Strong organization skills to effectively manage time and resources in the most efficient manner. The ability to multi-task on several projects and adapt to changing scopes and deadlines. Diligent note taking during project discussions. Efficient and organized email communications.
    • Commitment to maintaining the company’s professional image and reputation with timely, error-free, accurate deliverables, which meet or exceed clients’ expectations.

     PHYSICAL DEMANDS AND WORK ENVIRONMENT:

    Generally, the position requires proficient computer skills with extended periods of six to eight hours sitting and entering data into a computer with intense attention to detail.

    Occasional lifting on the job is generally limited to moving computers, scanners, hand tools, meters, and manuals or files whose length and size cause them to be clumsy to move around, and whose weight is usually under 50 lb.

    The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this position. Reasonable accommodation may be made.

    STATUS: In-Office 100%


    Qualifications Education Preferred Bachelors or better. Experience Preferred Current enrollment in Bachelor of Science in Engineering program (Mechanical preferred Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities
    This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor.

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    The Company
    HQ: Irvine, California
    2,062 Employees

    What We Do

    Salas O’Brien is an employee-owned engineering and technical services firm focused on advancing the human experience through the built environment. Our team is engineered for impact™, helping clients achieve critical goals, advancing our team members through growth and opportunity, and operating at the center of important global issues, including sustainability and decarbonization. We are a top firm as ranked by Engineering News-Record and Consulting-Specifying Engineer, and we have appeared for over a decade on the Inc. 5000 list of North America’s fastest-growing private companies.

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