Mechanical Engineer II

Overview

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 Mechanical Engineer II in our Washington, D.C. 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.

Exercise independent judgment to develop and document system designs from concept plans and technical design criteria and interpret and utilize information set forth in the basis of design as well as information gathered from users, project partners, field surveys, and code research.

• BSAE or BSME required.
• 5-10+ years’ experience designing HVAC building systems in technically sophisticated facilities.
• PE License or ability to become licensed.
• Expertise in computer operation for engineering design programs (i.e. Revit MEP, AutoCAD, Navisworks) preferred.
• Understanding of applicable design codes, design standards and specification requirements, and ability to interpret them.

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

• 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.

Estimated starting salary range is $90,000 to $150,000.

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