** DISCLAIMER: This posting is used for CAMPUS CAREER FAIRS. If you did not see us on your school's campus, please feel free to apply. Our internship recruiting process can take up to 2 months, so we appreciate your patience as we work through our career fair schedule. **
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.
PreFab Intern (Summer 2026): This is where you come in.
We’re looking for a PreFab Intern to join our Fabrication Shop team for the summer of 2026. In this hands-on role, you’ll gain real-world experience in mechanical prefabrication, manufacturing processes, and construction innovation. You’ll support the PreFab team in transforming digital designs into real components — helping us deliver smarter, faster, and safer building solutions to our customers.
You’ll have the opportunity to work alongside skilled tradespeople, engineers, and project leaders, learning how mechanical systems come to life in a controlled fabrication environment. From interpreting technical drawings to supporting production workflows, this internship will provide valuable exposure to both the craft and the engineering sides of mechanical construction.
In return for your initiative and commitment, you’ll gain mentorship from industry experts, hands-on technical experience, and a strong foundation for a future career in design, fabrication, or project engineering.
Top Deliverables in Your First Summer to Be a Hero
- Support the fabrication team in daily shop operations, including layout, assembly, and component preparation.
- Interpret and work from blueprints, shop drawings, and CAD models to understand design intent.
- Assist with the coordination and tracking of materials, tools, and equipment for fabrication projects.
- Learn to operate and maintain shop tools and machinery safely and efficiently under supervision.
- Participate in continuous improvement initiatives to enhance shop productivity, safety, and quality.
- Collaborate with engineers, project managers, and trades to ensure fabricated assemblies meet design specifications.
- Gain an understanding of prefabrication and modular construction methods and their impact on project efficiency and sustainability.
- Maintain a clean, organized, and safe work environment consistent with MacDonald-Miller’s safety standards.
Your Background: What Kind of Person Will Thrive in This Role?
You should have:
- Current enrollment in a Mechanical Engineering, Manufacturing Engineering, Industrial Engineering, or related technical program.
- Foundational understanding of manufacturing processes, materials, and mechanical systems.
- Basic familiarity with CAD software (SolidWorks, AutoCAD, or Revit) and an ability to interpret 2D and 3D drawings.
- Strong mechanical aptitude and interest in hands-on, fabrication-focused work.
- Ability to work full-time (40 hours per week) during the summer internship period (approximately June–August 2026).
How Your Colleagues Will Describe You
- Curious and Hands-On: You love to learn by doing and aren’t afraid to roll up your sleeves.
- Reliable and Accountable: You take ownership of your work and deliver results safely and on time.
- Team-Oriented: You communicate clearly and collaborate respectfully across shop and office teams.
- Detail-Focused: You value precision, safety, and craftsmanship in every task.
- Growth-Minded: You seek feedback, embrace challenges, and are eager to develop new technical skills.
You’ll be motivated by:
- Gaining exposure to real-world fabrication and construction environments.
- Working with state-of-the-art tools, materials, and technology.
- Contributing to a team that’s redefining what’s possible through innovation and prefabrication.
- Building relationships and skills that will set you apart as you launch your engineering career.
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
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.
