Our Firm

J+M Engineering is a full service Mechanical, Electrical, Plumbing and Fire Protection Engineering Design firm with offices located in Philadelphia, PA and Washington, DC specializing in sustainable building systems design, permitting services and construction administration.


Our Certifications

J+M Engineering DC, LLC certified business entity in Washington, DC. CBE# LSDZRV68993052021

Certified Passive House Consultant by Passive House Institute U.S.

Certified Fire Protection Specialist by National Fire Protection Association.

Registered Professional Engineer in the following states: Pennsylvania, District of Columbia, Maryland, Virginia, New Jersey, New York, Connecticut.


Our People

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Aaron Johnson

Mr. Johnson brings over fifteen years of experience to the MEP engineering design and construction industry within the Washington, DC and Philadelphia, PA markets. Aaron began his career with the firm AI Architecture (now Perkins+Will), later advancing to Ebert & Baumann Consulting Engineers. Aaron has extensive project design and management experience with base building projects and tenant fit-outs. Mr. Johnson seeks to engage clients and design team members in collaborative approaches to identify the appropriate and most sustainable MEP solutions. Aaron holds a degree in mechanical engineering from Howard University and began J+M Engineering in 2013.

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Joe Matje

Mr. Matje’s design and construction expertise spans over fifteen years. With both general contractor and A/E firm experience, he is equally adept at design engineer and/or project manager roles on projects ranging from higher education buildings and high-rise office towers, to government facilities and multi-family housing. Joe is a proponent of sustainable design, exhibiting this commitment by leading detailed energy consumption studies and lecturing on the integration of green engineering design with architecture. Joe also authored Energy Design in the Year 2031. Mr. Matje graduated from Villanova University with a degree in mechanical engineering and later served as the lead mechanical engineer at Bruce E. Brooks and Associates. He joined the firm J+M Engineering full time in 2018.

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Richard Hwang

Richard Hwang has been involved in engineering and construction for 13 years. In 2008 he settled in Philadelphia and entered the turnkey design build sector, gaining valuable experience bringing designs from paper, to the field with his own hands. Taking that experience into MEP consulting in 2012, he designed and managed projects ranging from sustainable LEED buildings, to historic renovations. He was senior mechanical engineer at Bruce E. Brooks & Associates. He graduated from Loyola Chicago in physics, and Washington University in St. Louis in mechanical engineering. He joined J+M Engineering in 2019.