Who We Are

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, California, and more, 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.


Eric Johnson, CxA, LEED AP

Eric brings an incredible history of construction, design engineering, and commissioning to RJA. With over 13 years experience in the industry Eric's project experience includes health care, K-12, higher education, commercial and government.

Eric Johnson

Darin Ramirez, PE, LEED AP, CGD

Dedicated to high performance and client satisfaction, Darin has been designing and building new and renovated buildings since 2004. For each project, the focus remains on providing design solutions and services that are efficient and appropriate for the owner over the life of the building.


Erica Ferdani, The Built Marketing Company:
"To find an engineer with this combination of passion, technical expertise and communication know-how is rare. I worked with Darin for two years as part of the Governor's Energy Office High Performance Building Program. His presentations on High Performance topics such as Building Envelopes, GeoExchange, and Net Zero Buildings received consistently positive feedback from workshop and webinar attendees across Colorado."

Steve Connell, AIA:
"I've worked with Eric on several small renovation projects over the past four years. His attention to detail and responsiveness has made sure that I'll continue to call RJA for our design needs."