Do it Once. Do it Right.
About Cobex.

Our founders share a passion for construction, family, and faith.

Each of their families came to America when they were children looking for freedom and opportunity. Dmitriy, Sergey and Vazgen have embraced the chance to build a company that reflects their shared values of integrity, professionalism and reliability. With 30 years of construction experience combined, our founders had a vision to create a different kind of construction company. In 2017, Cobex Construction Group was created as a family-oriented company based on four cornerstones: Stress-Free Customer Experiences, Long Term Customer Relationships, Quality Workmanship, and of course Transparency. 

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Our Team

Vazgen Dallakyan


When Vazgen (Vaz) was a toddler, his family moved from Armenia to the U.S. in pursuit of safety and freedom. His Grandfather instilled in Vaz a belief that, in America, he would be successful if he worked hard and stayed true to himself…

Dmitriy Matushevskiy


Those who know Dmitriy Matushevskiy well today will attest that he is not a hard person to read. His values and priorities were carved into his character since childhood. Born in the Ukraine during a period of extreme religious persecution..

Yuriy Silchuk

Project Manager

I am a Project Manager at Cobex. For the past 6 months, I have worked countless jobs involving attention to customers’ personal expectations and attention to detail. I am passionate about my project management position because it gets me to connect with customers and it makes their written expectations a reality. I have been recognized in my field for countless satisfied customer projects while going the extra mile to make sure customer satisfaction is at 101%. In my spare time, I enjoy being outdoors and spending time with family and friends. I currently live in the greater Sacramento Area.

Vasiliy Starovoytov

Project Manager

My name is Vasiliy Starovoytov, and I am a project manager at Cobex. For the past year, I have worked on hundreds of roofs. I am passionate about management because with great management comes good customer service. I have been recognized in my field for countless Leadership Excellence, and Employee of the year awards. In my spare time, I enjoy off roading my atvs with my kids. I currently live in Antelope, CA and love my small community.

Norberto Diaz

Project Foreman

I am passionate about being a Project Foreman because I enjoy monitoring the budget and schedules, assigning tasks to crew members and minimizing errors. In my spare time, I enjoy watching boxing, football and soccer. I also love spending time with my wife and 2 sons. 

Conner Wilson

Project Consultant

My name is Conner Wilson, and I work as a Project Consultant at Cobex. I am a new addition to the team and have exemplified my work ethic and passion for this company. I am currently attending Sacramento State for my Bachelor’s Degree in Criminal Justice. I am a hard worker nonetheless and have shown my ability to be a studious and dedicated individual. In my spare time, I enjoy all outdoor activities such as mountain biking, fishing, and wakeboarding near my residence in El Dorado Hills, CA.

David Leal

Residential Consultant

I love helping families make educated decisions on both small and large home improvement projects. My goal here is to serve the community well and show love through my actions. I enjoy spending time with my family, biking, fishing, and enjoying all of God’s creations. I would say my secret skill is that I am  able to organize the dishwasher better than the Tetris world champion.

Marina Dallakyan

HR, Executive Assistant

Being a part of the Cobex team has been absolutely amazing. We have a great culture that makes coming to work enjoyable! Outside of work I enjoy spending time with my spouse and two boys. We love to travel, hike and read lots of books!

Noel Ortega

Production Assistant

I was one of the first employees at Cobex, He has worked in many different departments, getting some sales experience , before finding his place in the Production Department. Other than work, he spends most of his free time serving ministry and hanging out with his friends. 

Annie Kopychuk

Accountant, Office Admin

I saw myself grow in this company, I still remember the days when I was just the errand girl. My goal here at Cobex is to learn everything about accounting be the head accountant, form new relationships, and possibly start growing and helping a new department. My mindset is that nothing is impossible, with that let’s go find a solution. 

Dave Farnum

Residential Consultant

I live in Auburn and have made my home in the Foothills for over 30 years. I have had my General Contractors license since 1992. My wife, Ruth and I enjoy boating and spending time at the Ocean. We have 3 kids and 6 grandchildren. I look forward to using my experience in helping you with your next project. 

Sergey Kolesnikov

Exterior Trades Field Manager

I’m a husband and a dad to two amazing girls. While I’m not busy with work, I enjoy spending time with them. I have a passion for home design and renovation, and strive to complete all my work with attention and perfection to detail. As a project a manager at Cobex, there’s a chance I’ll be your main point of contact throughout your renovation process. 

Sergey Kopychuk


Sergey Kopychuk, like his partner Dmitriy, was born in the Ukraine. His Grandfather was imprisoned for his religious beliefs, which motivated his family to move to the United States when he was two years old. Although Sergey has no vivid memories…