Senior Mechanical Engineer

About You: Do you have an entrepreneurial spirit and a passion for engineering? Do you love designing  and  implementing complex electrical systems?  Are you looking for a company that is constantly trying to push the boundaries of what it means to offer a better construction solution process by using design/build?  If the answer is, “Yes!” then we have an opportunity that will excite you. Who are we? We are ARCO, a Family of Construction Companies.   ARCO/Murray Engineering is seeking a Senior Mechanical Engineer to join our Mission Critical Engineering team in Downers Grove, Illinois. In this role, you will lead the full mechanical scope for hyperscale, colocation, and enterprise data center projects, guiding the development of complex cooling and mechanical infrastructure systems essential to high-availability facilities.   You will join an established but rapidly growing design/build group focused on delivering reliable, scalable, and efficient data center solutions. Our team collaborates closely with internal construction partners, project managers, and commissioning teams—working together to deliver world-class mission-critical environments.   A Day in the Life:  Lead the mechanical design process for mission-critical data centers, including chilled water systems, DX systems, CRAH/CRAC, heat rejection, and white-space cooling. Guide system development from early concept and basis-of-design through construction documentation,