Senior Mechanical Engineer

Join a Team Where Engineering Excellence Drives Opportunity

At Affiliated Engineers, Inc. (AEI), we bring together expertise and innovation to solve the most complex challenges. Since 1978, we've supported mission-driven organizations in designing systems and environments that advance society and improve lives. Today, with more than 900 professionals across 22 offices, we help shape the future of healthcare, science and technology, energy, education, and other vital sectors.

From elevating patient care in Mayo Clinic's world-class hospitals to enabling discovery in high-containment laboratories for U.S. agencies and driving environmental progress with Microsoft's renowned Thermal Energy Center, our work enriches the human experience, safeguards the environment, and pushes the boundaries of possibility.

AEI consistently earns national recognition from leading industry publications, including Building Design+Construction, Engineering News-Record, and Consulting-Specifying Engineer, with distinctions such as being named the #1 Laboratory Engineering Firm in the nation and receiving multiple Best of the Best Project awards, underscoring the lasting legacy of our work.

At AEI, you'll join a collaborative community where your expertise fuels innovation, your ideas drive progress, and your work helps shape a brighter future.

As a Senior Mechanical Engineer in our Boston office, you will help us empower our clients to achieve energy-efficient building solutions, save global environments, and create a better, greener future for all.

Why we need you: 

In this role, you will be responsible for engineering design process on assigned projects within a particular discipline. You will lead and develop innovative and unique engineering solutions to align with project, client and project partner's needs, and leads the discipline team in implementing the solutions.

Expertise of our most successful Senior Mechanical Engineer:

• BSME/BSAE (or other engineering discipline with applicable experience).
• 10+ years of experience designing HVAC building systems for research, Healthcare or Higher Education facilities.
• Professional engineering registration preferred.
• Proficiency in computer operation for engineering design programs (i.e. Revit MEP, AutoCAD, Navisworks) preferred. 

Effective skills to help you flourish:

• Strong spoken and written communication skills.
• Excellent organization and time management skills.
• Quick technical comprehension and motivation focused on client outcomes.
• Ability to prioritize multiple tasks.
• Effective working individually and within team environments.

When you work here, you can expect:

• A flexible, collaborative environment where your well-being matters—because your best work happens when you're supported.
• Real opportunities to grow—through mentorship, professional development programs, and exposure to high-impact projects across disciplines.
• To collaborate with inspiring teammates who challenge the status quo, foster innovation, and pave the way for future leaders.
• A benefits package that offers health, dental, vision, and retirement, a performance-based year-end bonus, and thoughtful perks tailored to your needs—whether that's a flexible work environment, wellness resources, or community-focused initiatives, we'll continue to invest in.

If this dynamic environment and the chance to contribute to transformative projects resonate with your ambitions, we would love to connect with you. Join us and make an impact

Apply online at

If you know someone who would thrive in this role, please share this posting with them directly via email or through your LinkedIn network.

AEI is proud to be an EEO/AA Employer/Vet/Disabled.