Who We Are 2017-06-26T16:51:40-05:00


Client Service Focused

In 1977, our firm began with the philosophy of providing high quality services, in a timely manner, for a reasonable fee.  This philosophy has served both our clients and our firm well.  Our focus has always been to develop long lasting relationships with our clients and we are committed to collaboration, quality, and integrity.

We provide civil and structural engineering services throughout Missouri from our headquarters in Jefferson County.  VonArx Engineering has experienced steady growth since its beginning.  Over the years our firm has expanded its services to meet the needs of our clients.  Today, our primary services include – Transportation Engineering, Storm Water Management & Design, Residential & Commercial Site Development, Structural Design, Sewer & Water Systems, and Structural Inspections.

Our team is passionate about what they do and is dedicated to exceeding client expectations.  We take pride in delivering personal service and establishing lasting relationships with our clients.  With years of experience, our team is ready to tackle any project, regardless of size or scope.  Our client service approach, supported by our professional, knowledgeable and experienced team assures an accurate, timely and cost effective solution on any project. The small size of our firm has not limited our ability to successfully complete large and small projects, but has enhanced our ability to provide personal attention and build long lasting relationships with our clients.  We have been and will remain client focused at all times while providing high quality services, in a timely manner, for a reasonable fee.

Simply put:
We do great work. We get it done. We exceed our client’s expectations.


Going the Extra Mile, Solving Your Problems.

With VonArx Engineering, you’ll get honesty, integrity, and experience.

At VonArx Engineering we take an interest in our clients to best serve their needs. We have learned it is essential to establish a personal relationship with our clients. Our team isn’t just interested in working for you, but with you. This collaborative effort lets them know we care about going the extra mile.

We understand your project is important to you and therefore it is important to us. We provide you with frequent, routine project updates to keep you informed. Our clients trust us and know that not only will we get the job done, but that we listened to them so that it gets done right. Most of our projects are from repeat business or referrals. Receiving repeat business and referrals is the highest compliment we could receive from our clients. It’s the true measure that lets us know we are doing business right.

VonArx Engineering is committed to providing our clients with the highest quality engineering services, value, and best client experience that is worthy of your repeat business or referral.

We do the right thing.

We tell the truth.

Expertise you need.


Kelley Vonarx
Kelley VonarxCEO, Operations & Marketing
Kelley joined VonArx Engineering in 2013. As Chief Executive Officer, Operations & Marketing, she has direct responsibility for managing our daily operations, finances, accounting, human resources, business development and marketing. Kelley is also responsible for internal project administration, assists with proposal writing and submissions, and overseeing management of project schedules. She is responsible for the vision and strategic planning and provides leadership and team direction to ensure VonArx Engineering’s mission is applied to each client and project.

Kelley has a B.S. in Business Administration from the University of Missouri – Columbia. She has acquired her experience and knowledge working for several private companies and not-for-profit organizations. Kelley brings 20 years of experience in marketing, management, accounting, and human resources.

David Vonarx, PE
David Vonarx, PEPresident/Principal
Dave has been President and Principal since 2002. Dave is responsible for all engineering work performed by our team and the responsibility of project delivery to our clients. He provides leadership, mentoring, and direction to our team. Dave is also responsible for business development, proposal writing and submission, and overseeing management of project schedules. He also assists in vision and strategic planning and ensures VonArx Engineering’s mission is applied to each client and project.

Dave has more than 28 years of experience in civil engineering. His career includes hundreds of infrastructure and site improvement projects for municipal, institutional, and private clients. Dave received a M.S. in Civil Engineering from Purdue University where he specialized in hydraulics and hydrology and a B.S. in Civil Engineering from the University of Missouri- Rolla where he is a member of the Academy of Miner Athletics and the MSM/UMR/Missouri S&T Athletic Hall of Fame as a member of the 1985 Cross Country team. Dave is a registered Professional Engineer in Missouri and Illinois.