Senior Mechanical Engineer

About the role

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.

Responsibilities

• 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, commissioning, and turnover.
• Apply ASHRAE TC 9.9 guidance and critical environment standards to ensure reliability and efficiency.
• Perform cooling load calculations, CFD coordination, and mechanical equipment sizing.
• Cookordination with electrical, controls, and architectural teams to ensure system integration supporting N, N+1, and 2N redundancy.
• Generate design and construction documents using Revit and AutoCAD.
• Support construction by reviewing RFIs, submittals, and field conditions.

Requirements

• 7–20 years of mechanical engineering experience with data centers or mission-critical systems
• Bachelor’s degree in Mechanical Engineering, Architectural Engineering, or related field
• Proficiency with Revit and AutoCAD
• Strong understanding of critical cooling systems and redundancy strategies
• Experience in design/build is a plus
• Willingness to travel to project sites as required (e.g., 10-30%)
• Familiarity with engineering deliverables in a GC setting (i.e., design-build or EPC support) is a plus

Qualifications

• Professional Engineer (PE) license preferred

Skills

• Strong problem-solving skills
• Excellent communication and collaboration abilities
• Ability to manage multiple projects simultaneously
• Knowledge of industry standards and best practices

Benefits

• Industry-leading performance-based bonus program
• Employee Stock Ownership Plan (ESOP)
• Traditional and Roth 401k
• Tuition reimbursement for associates
• Scholarship for associates’ children up to $28,000 per child
• 1-month paid sabbatical after every five years of employment, plus $5,000 for travel
• 1-week paid volunteer leave each year
• 100% charitable match
• Medical, dental, and vision insurance coverage
• Paid parental leave

Pay

Typical base compensation for the Senior Mechanical Engineer role is between $90,000 and $130,000. Candidates with extensive experience may exceed this range.

Schedule

Flexible schedule to accommodate project needs.