720-598-0774 info@rja-eng.com

Meet Our Engineering Team


Who We Are.

Founded in 2009, Ramirez, Johnson, and Associates was formed on the principles of providing engineering solutions with a customized approach that delivers the best value for every project. As a small firm, we can give each client and project the personal attention deserved. Licensed in Colorado, Wyoming, and Utah, our engineers, commissioning agents, and designers are ready to take on projects ranging from $1,000 to $100,000,000, including commercial spaces, healthcare facilities, educational facilities, multi-family and high-end custom residential projects. RJA is M/WBE, DBE, SBE, EBE Certified.

Our Partners.

Darin Ramirez

Darin Ramirez

Founding Partner

As a founding principal of RJA, Darin provides over 16 years of experience in the design, construction, and consulting industry.  He is involved in all aspects of the firm’s 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 clients.  Off the clock, Darin can usually be found chasing his two girls making monster noises or climbing and skiing in the Rocky Mountains.

Education:
Bachelor of Science, Mechanical Engineering, University of Florida

Affiliations and Registrations:
Professional Engineer:  CO, WY, UT, & OK

Certified Geoexchange Designer

LEED AP

Eric Johnson

Eric Johnson

Founding Partner

Eric’s passion for buildings and sustainable design directs the work of the firm and his construction and contracting background provides a practical perspective on each project. With over 17 years 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 and the project. As a strong community supporter, Eric volunteerism through Junior Achievement helps to provide a positive and lasting impact on young people’s economic and entrepreneurship skills, career choices and success.  During his free time, Eric enjoys skiing, hiking, golfing and spending time with his family.

Education:
Bachelors of Science in Architectural Engineering from University of Colorado

Affiliations and Registrations:
LEED AP

Certified Commissioning Authority, CxA


Our Engineers.

Paul Plewczynski

Paul Plewczynski

Electrical Engineer

Paul is an electrical engineer with 13 years of engineering experience in the Denver area. His background includes roles on the Owner’s team as well as on the consulting side of the industry.  Paul is responsible for spearheading RJA’s Revit/BIM collaboration with our clients, and he specializes in new and existing projects that require creative power distribution design.

Paul enjoys hiking, backpacking, and mountain biking with his wife and three kids.

Education:
Bachelor of Science, Electrical Engineering Technology, MSU Denver
Associates Degree, Computer Aided Drafting, ITT Technical Institute

Affiliations and Registrations:
ICT Design Fundamentals

Scott Zimmerman

Scott Zimmerman

Mechanical Engineer

Scott is a mechanical engineer with 9 years of design experience in the commercial and industrial sectors. His varied project background includes telescope observatories, college sports facilities, mineral processing plants, commercial kitchens, and breweries/distilleries. Scott is well versed in BIM/VDC design process and is a proponent of 3D modeling software.

In his free time, Scott enjoys fourwheeling and exploring Colorado’s backcountry.

Education:
Bachelor of Science, Mechanical Engineering, University of Arizona

Affiliations and Registrations:
Professional Engineer: CO & AZ
Member ASHRAE, former Chapter President
LEED Green Associate

Judah Katz

Judah Katz

Mechanical Engineer

Judah is a talented and detail oriented individual with 5 years of mechanical and plumbing design experience in the residential, commercial and light industrial sectors. His project experiences are comprised of a diverse group of industries including educational facilities, restaurants/breweries/bars, retail spaces, institutional housing, and higher education.  Technically, Judah is adept in the use of multiple energy modeling, BIM, and design software.  Family, music, and finding ways to enjoy the sun are his choice when not in the office.

Education:
Bachelor of Science, Mechanical Engineering, University of Alabama

Affiliations and Registrations:
Member ASHRAE

Isaiah Inderrieden

Isaiah Inderrieden

Electrical Engineer

Isaiah began his career in architecture 2001. After transitioning into Electrical Engineering, his aim is to integrate a building’s required MEP systems with careful consideration for architectural design goals.  Before relocating to Colorado, Isaiah worked in Southern California, designing systems to meet the region’s stringent planning, zoning, and energy requirements. His resume spans high-end residential homes to commercial and process facilities.  On the weekends, Isaiah enjoys fly fishing, backpacking, ice hockey, and skiing. 

Cody Young

Cody Young

Mechanical Engineer

Cody comes to RJA from the Colorado School of Mines in Golden. While earning a degree in Mechanical Engineering, he focused on HVAC concepts and participated in studies on building energy reduction. His project background in the Denver metro area includes mid-level commercial projects,  residential housing and he is well versed in CAD and Revit.  In his spare time, Cody pursues his passion for skiing and fly fishing.  He is a fifth-generation Colorado native.

Education:
Bachelor of Science, Mechanical Engineering, Colorado School of Mines

Affiliations and Registrations:
Member ASHRAE

Theresa Gray

Theresa Gray

Electrical Engineer

Working in the electrical and lighting design industry since 2001, Theresa’s passion for lighting design and efficient power systems has helped shape countless projects.  Theresa is licensed professional engineer and active member of the Illuminating Engineering Society of North America. 

Education:
Bachelor of Science, Architectural Engineering, University of Colorado, Boulder

Affiliations and Registrations:
Professional Engineer:  CO, WY, CT
IES
LEED AP

Cory Bondurant

Cory Bondurant

Mechanical Engineer

Cory earned a degree in Mechanical Engineering from the University of Kansas, and spent his early career designing systems across the Midwest from the Kansas City area. Cory brings diverse experience spanning industries such as health care, education, and commercial office spaces. In his spare time, he likes to hike, chase after his dog, read, and explore Denver.

Education:
Bachelor of Science, Mechanical Engineering, University of Kansas

Affiliations and Registrations:
Member ASHRAE

Nathaniel Morrison

Nathaniel Morrison

Electrical Engineer

Nate is a recent graduate from the Colorado School of Mines and is beginning his career at RJA. While in school, Nate learned commercial electrical design through his capstone project. In his free time he enjoys running, backpacking, and traveling. 

Education:
Bachelor of Science, Electrical Engineering, Colorado School of Mines

See What We’ve Been Working On

View some of the engineering projects our team has designed locally, in the state of Colorado, and across the country.  We’ve created solutions for commercial, retail, food service, multi-family housing, healthcare, renovation, hospitality, government, industrial, laboratory and tenant finish projects.

Contact Our Denver Team

We consider projects of all sizes from across the state of Colorado, as well as in the states of Utah and Wyoming. Talk to our team to see if RJA is right for your next engineering project.

OUR CERTIFICATIONS

  • Professional Engineering
  • MBE, DBE, SBE, EBE
  • Member of the AABC Commissioning Group
  • CXA Certified Commissioning Agents
  • Certifiably Green Denver

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OFFICES & CONTACT

2590 Walnut St.
Denver, CO 80205
e: info@rja-eng.com
p: 720.598.0774