Summer 2026 Internship - Design Engineering

Disclaimer : This posting is part of our university recruiting process. If we were not recently on your campus, you are still encouraged to apply. Our internship selection process may take up to two months, and we appreciate your patience as we review applications.

At MacDonald-Miller Facility Solutions (“MacMiller”) we make buildings work better () . As the Northwest’s leading mechanical contracting firm, we design, deliver and service HVAC, plumbing and automation system solutions for commercial buildings. With our over 1500 employees across 15 offices, there is a breadth and variety of work to keep you engaged and inspired.

We enjoy a well-respected history of exceeding our customers’ expectations and executing with distinction () . Our clients trust their toughest projects with our integrated teams, including :

New Construction – Engineering, fabrication and installation of mechanical systems for new projects following lean construction practices

Special Projects – Retrofits and mechanical repairs for existing buildings for new efficiencies

Service - Scheduled preventative maintenance ensuring tenant comfort, and 24 / 7 emergency response

Building Performance – Control systems, fault detection, energy services and remote monitoring

Performance Contracting - Sustainable Solutions : Acting as the Prime Contractor, we deliver design-build energy-efficient solutions in the built environment for private and public sector clients

People love to work at MacDonald-Miller, and it’s because we all share the same Core Culture Values : ()

Collaboration () – Diverse players, one team, a common vision. Collaboration is our foundation and critical to the success of the company. Every team member is valued and brings a diversity of strengths to help us meet our common vision.

Dedication () – We are dedicated to personal and professional excellence. We execute with distinction by doing the right thing and following through on our commitments.

Safety () – Everyone deserves a safe workplace. Safety is more than hardhats and boots, it’s an attitude and the environment we create. Every day, everyone goes home to their families.

Community () – We are proud to be part of MacDonald-Miller. We actively seek to build relationships and know each other as individuals. Together we create an environment that is welcoming, caring, and trusting.

Innovation () – We are committed to continuous, creative problem solving () . Innovation is how we stay an industry leader. We always strive to challenge and better ourselves.

Fun! () – Take the work seriously, but never take ourselves too seriously. It’s possible to be both serious professionals and good-natured people you enjoy working with. We strive to be both.

Requirements

Design Engineering Interns : This is where you come in

Our Design Engineering Department takes concepts and ideas from our project teams and turns them into real, buildable mechanical systems. You’ll get a behind-the-scenes look at Commercial HVAC and Plumbing design, learning how we turn engineering intent into drawings, selections, calculations, and coordinated systems that actually work in the field.

Top 3 things to deliver in your first year to be a hero :

Learn as much as you can about HVAC, plumbing, and mechanical contracting.

Help your team. Work on engineering drawings, run calculations, review submittals, draft load calculations, and help come up with possible design solutions.

Have a great time and explore if a future with MMFS is right for you, or if design engineering is your path.

Interns report to our Senior Mechanical Engineers on a collaborative team working on a variety of design projects and initiatives that support our growing business.

Your Background : What kind of person will thrive in this role?

You should have…

An interest in mechanical systems, HVAC design, plumbing design, or engineering

A natural love of problem-solving and learning new things

An in-progress or completed bachelor’s degree in mechanical engineering, construction management, or a related field

And everyone you work with should describe you as…

Hard working

Very adaptable

Positive with a can-do attitude

A strong communicator

And you should be motivated by…

Empowering yourself to learn how to do things. If you need a ton of handholding or a micro-manager boss, this is not the place for you

Working in a lean, results-oriented environment where you’re expected to take on more, grow quickly, and deliver strong results

Having fun in an environment full of transparency, innovation, and a supportive family feel

Benefits

Compensation : You will be paid $24 / hr for the duration of your internship.

MacDonald-Miller Facility Solutions presently provides Interns coverage for :

Medical, dental, vision for employees (coverage available for dependents for shared premium)

Paid Sick Leave, and Holiday Pay

Wellness Program

Where you will work

Our Seattle HQ office (17930 International Blvd, SeaTac, WA 98188) has easy access to the SeaTac International Airport, ample secured parking, and newly renovated office facilities - not to mention great views! Neighborhood amenities include an onsite deli, restaurants, and convenient freeway / airport access.

Interested in learning more?

If you’re ready for an adventure, and are interested in being considered for this role, click apply to start the conversation!

MacDonald-Miller Facility Solutions is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.