RJA Engineering

Darin Ramirez

Founding Partner

PE, LEED AP

As a founding principal of RJA, Darin provides experience attained since 2004 in the design, construction, and consulting industry. He is involved in all aspects of daily operations. As designer, Darin's passions include collaborating with owners and users to truly understand their needs, and providing design solutions that are efficient and appropriate for each client.

Eric Johnson

Founding Partner

CxA, LEED AP

Eric's passion for buildings and sustainable design directs the work of RJA, and his construction and contracting background provides a practical perspective on each project. With two decades of experience, Eric is involved in either a design or commissioning role on every project and excels at leading talented engineers and designers towards solutions that are in the best interest of the client.

Paul Plewczynski

Electrical Designer

Paul has amassed engineering experience in the Denver area since 2007. His background includes roles on the owners' team as well as on the consulting side of the industry. He is responsible for spearheading Revit/BIM collaboration with clients, and specializes in new and existing projects that require creative power distribution design.

Scott Zimmerman

Mechanical Engineer

PE, LEED Green Associate

Scott is an established mechanical engineer with a wealth of experience spanning the commercial and industrial sectors. Since 2010, he has brought his expertise to a wide range of projects, from telescope observatories and state-of-the-art college sports facilities to mineral processing plants, commercial kitchens, and craft breweries and distilleries. With a mastery of the BIM/VDC design process, he is an advocate for leveraging 3D modeling software.

Judah Katz

Mechanical and Plumbing Designer

CxA

Judah is a talented and detail-oriented designer with over a decade of mechanical and plumbing design experience in the residential, commercial, and light industrial sectors. His project experiences are comprised of educational facilities, restaurants, breweries, retail spaces, institutional housing, and higher education.

Chris Wood

Mechanical and Plumbing Designer

Chris launched his career in 2012 as a mechanical and plumbing designer, gaining valuable experience in multi-family and light commercial construction. Over the years, he has engineered and managed a wide range of projects, from large-scale 350-unit multi-family buildings to smaller office tenant finishes.

Henry Furuta

Mechanical Engineer

PE

Henry launched his career in the MEP industry in 2018, bringing his expertise to a diverse range of projects nationwide, from sports stadiums to office tenant improvements. He thrives on bringing designs to life through 3D modeling.

Derek Wetch

Mechanical and Plumbing Designer

Derek brings a unique blend of mechanical and plumbing design expertise, with a strong background in the multi-family and restaurant sectors. His experience as a field engineer provides him with a comprehensive understanding of the design and construction process.

Meryem Canoz

Electrical Designer

Meryem's electrical design experience covers single-family homes, hotels, apartments, restaurants, and office buildings. She focuses on power distribution systems, optimizing efficiency and safety, and load analyses for complex, mixed-use buildings.

Huseyin Martin Yildiran

Mechanical and Plumbing Designer

Martin is a skilled mechanical and plumbing designer who thrives on helping owners and contractors uncover design efficiencies. He plays a key role in RJA's commitment to guiding clients through the complexities of the updated Energize Denver requirements and brings specialized expertise in California Title 24 energy standards.

Ava Lawrence

Mechanical Engineer

EIT

Ava specializes in designing innovative mechanical and plumbing systems for residential, commercial, and office spaces, bringing valuable engineering experience since 2020.

Mike Sullivan

Mechanical and Electrical Design Professional

PE

Mike has been working as an MEP design professional since 2021. Drawing on valuable experience from the contracting sector, he delivers high quality solutions for commercial, residential, and light industrial projects, bridging the gap between mechanical, plumbing, and electrical trades.

Quinn Thielmann

Mechanical and Plumbing Designer

EIT

Quinn's journey in mechanical and plumbing design began during his college internships. With a background that spans several states and federal projects, he is a skilled professional in MEP design.

Colin Nolan

Mechanical Designer

Colin earned his degree in Mechanical Engineering with a focus on aerospace engineering from the Colorado School of Mines. He has direct experience in construction management, providing him with a strong understanding of the construction process and water treatment facilities.

Gabrielle King

Electrical Designer

Gabrielle earned her degree in electrical engineering with an emphasis in renewable energy. Her background includes working at an electric utility, gaining experience with wildfire conditions and substation distribution engineering.

Guillermo Rivas

Electrical Designer

Guillermo earned his degree in Electrical and Computer Engineering in 2024. He focuses his expertise on MEP design for diverse sectors, including education, healthcare, and government projects, bringing a customer-centric perspective to every project.

Zack Hoyt

Lighting Engineer

LC

Zack is a seasoned lighting engineer with over 10 years of experience in lighting exteriors, commercial, federal, municipal, roadways, retail, office, multifamily, airports, and educational projects.

Jessie Thomas

Business Manager

Jessie excels at navigating complex financial landscapes and improving operational efficiency, specializing in budgeting, financial forecasting, and strategic planning to optimize processes.