Mechanical Engineering Intern | St. Louis, MO

Mechanical Engineering Intern | St. Louis, MO

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Mechanical Engineering Intern | St. Louis, MO

This posting is for Summer 2027 Internship opportunities.

is hiring a Mechanical Engineering Intern in St. Louis, Missouri. Over 10-12 weeks, you'll assist in the analysis, design, and implementation oversight of mechanical systems for the vertical building industry while gaining hands‑on experience alongside experienced engineers and consultants. In this role, you'll support project documentation, coordination, and job site observations while helping teams work within project budgets and meet client expectations.

You'll collaborate across disciplines on healthcare‑focused MEP work while advancing high‑performance, energy‑efficient design.

At a Glance
Location: St. Louis, MO
Discipline: Mechanical
Markets: Healthcare; MEP
Ownership: 100% employee‑owned (ESOP)
Work Schedule: Full‑time in office
Program Length: 10-12 week summer program
Sponsorship: Not available

What You'll Do

Assist with mechanical system design according to code and company standards

Research commercially available equipment and supporting resources

Support client relations, project design notebooks, and permanent record documentation

Coordinate design activities and schedules with architectural, structural, electrical, mechanical, technology, clerical, and equipment supplier teams

Document design decisions, meetings, and client instructions while monitoring project progress

Review project documents for accuracy and completeness before final check

Help prepare and issue addendum information

Conduct periodic job site observations and support other services required by the contract services agreement

What You'll Bring

Completed at least 2 years towards a Bachelor of Science (BS) Degree in Mechanical Engineering, or equivalent required

Prior internship experience in the building design consulting industry preferred

Proficient with MS Office Suite including, but not limited to, Word, Excel, and Outlook

Skilled in AutoCAD and/or Building Information Modeling (BIM) software

Ability to clearly communicate in both oral and written communication to individuals or groups

We put people at the center of who we are, creating positive outcomes for people, communities, and our planet.

A paid internship with real, hands‑on project work, not busywork

A structured program with an assigned mentor and a cohort of fellow interns

A clear path to full‑time: many interns and co‑ops convert to full‑time roles at

IDEA Program: a firm-wide innovation accelerator where employees across every discipline develop and scale new tools, from VR and AI to carbon‑reduction technology

Real impact from day one: at , an intern once became our Virtual Reality leader

Exposure across disciplines and offices at a 100+ office, employee‑owned firm

MEG, our in-house AI platform, helps employees find information and build agents that streamline project workflows and calculations

is an employee‑owned corporation, is committed to investing in employees’ futures through professional development programs and opportunities for career advancement. We offer a comprehensive benefits package including generous PTO, flexible schedule, and assistance with tuition reimbursement. Additionally, employees are eligible to enroll in health, dental, vision, and life insurance on their first day of employment.

is committed to providing equal employment opportunities in all employment practices, without regard torace, color, religion, sex (including sexual orientation or gender identity), gender, national origin, disability, age,…