QA/QC Engineer, Mechanical Systems

ARCO Companies; Downers Grove (IL); On-site; USD 75,000 - 95,000; Full time

Benefits offered by this job

ESOP

Traditional and Roth 401k

Company supported relocation

Tuition reimbursement for associates

Scholarship for associates’ children

1-month paid sabbatical after every 5y

1-week paid volunteer leave each year

Medical, dental, and vision insurance

Paid parental leave

Job summary

ARCO Companies, a family of construction firms, is seeking a QA/QC Engineer to support testing, startup, and commissioning of mechanical systems on design/build projects. The Jr.

Mechanical Systems Specialist will collaborate with project teams, vendors, and senior staff to ensure safe, reliable operation and energy-efficient performance. Ideal candidates have 2–5 years in mechanical systems operations or commissioning, strong reading of drawings, and familiarity with chillers, pumps, AHUs, and

Qualifications

• Bachelor's degree preferred; equivalent technical education or experience may be considered.
• 2–5 years of experience in mechanical systems operations, startup, or commissioning support.
• Strong knowledge of HVAC/mechanical building systems and related equipment.

Responsibilities

• Support startup, setup, testing, and troubleshooting of mechanical systems and controls.
• Assist with pre-startup readiness reviews and verify system readiness.
• Coordinate with BAS/controls teams and document testing observations and actions.
• Promote safety practices and maintain project documentation throughout turnover.

Skills

Mechanical systems operations

Field troubleshooting

Reading mechanical drawings

Communication skills

Travel readiness

Education

Bachelor's degree in mechanical engineering or related field

Tools

Procore

CxAlloy

Facility Grid

Job description

Are you passionate about quality and precision in construction projects? Do you thrive on ensuring compliance with rigorous standards while managing timelines and budgets? If the answer is, “Yes!” then we have an opportunity that will impress you. Who are we? We are ARCO, a Family of Construction Companies.

ARCO/Murray is seeking a QA/QC Engineer to support the testing, startup, setup, and troubleshooting of mechanical systems across design/build projects. This role is ideal for someone with 2–5 years of relevant experience who wants to grow their technical expertise in field execution, commissioning support, mechanical operations, and system performance verification. The Jr. Mechanical Systems Specialist will work closely with project teams, vendors, subcontractors, controls contractors, and senior technical staff to help deliver safe, functional, and reliable mechanical systems.

A Day in the Life

• Support startup, setup, testing, and troubleshooting of mechanical systems and associated controls
• Assist with pre-startup readiness reviews to verify equipment installation, piping completion, controls integration, labeling, and general system readiness
• Participate in vendor startup activities for chillers, pumps, cooling towers, air handling units, CRAHs, CRACs, hydronic systems, and related mechanical equipment
• Help execute pre-functional checklists, startup forms, and functional test procedures for mechanical systems
• Verify mechanical equipment and systems are operating in accordance with design intent, project specifications, and sequences of operation
• Assist in troubleshooting mechanical and controls-related field issues and support resolution with subcontractors, vendors, engineers, and project teams
• Observe and document system performance including temperatures, pressures, flows, alarms, safeties, and equipment staging during testing
• Support TAB coordination and help verify systems are properly set up for balancing and performance validation
• Coordinate with BAS and controls teams to verify point functionality, alarm status, communication, and sequence execution
• Document deficiencies, testing observations, and corrective actions clearly and accurately
• Support commissioning meetings, startup planning efforts, and system turnover activities
• Communicate field findings to project managers, superintendents, engineers, and senior commissioning or QA/QC staff
• Help maintain organized project documentation related to mechanical startup, testing, issue logs, and closeout
• Promote safe work practices and support compliance with project safety requirements

Necessary Qualifications

• Ability to travel to project sites as needed
• Bachelor’s degree in mechanical engineering, mechanical engineering tech., Construction Engineering, or related technical field preferred; equivalent technical education or relevant field experience will also be considered
• 2–5 years of experience in mechanical systems operations, startup, commissioning support, service, troubleshooting, construction, or building operations
• Basic to intermediate knowledge of HVAC and mechanical building systems, including chilled water, condenser water, pumping, air distribution, and heat rejection systems
• Familiarity with mechanical equipment such as chillers, pumps, cooling towers, AHUs, CRAHs, CRACs, VFDs, valves, and associated instrumentation
• Ability to read and interpret mechanical drawings, equipment submittals, and sequences of operation
• Strong mechanical aptitude and problem-solving skills with a desire to grow technical troubleshooting capabilities
• Comfortable spending time on active construction jobsites
• Familiar with construction practices and principles
• Strong communication skills and ability to work collaboratively with internal teams, subcontractors, vendors, and clients
• Proficiency in Microsoft Office Suite
• Experience with construction or commissioning software such as Procore, CxAlloy, Facility Grid, or similar platforms is a plus
• Experience in mission critical, industrial, healthcare, manufacturing, or other complex technical environments is a plus
• Relevant certifications or training related to commissioning, HVAC systems, controls, or mechanical operations are a plus

What We Can Offer You

We are dedicated to the well-being of our associates and are proud to be consistently recognized as a Best Place to Work. Our compensation and benefits package not only supports our associates and their families but benefits local communities and communities around the world.

• Employee Stock Ownership Plan (ESOP)
• Traditional and Roth 401k
• Company supported relocation
• 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
• Medical, dental, and vision insurance coverage
• Paid parental leave

Typical base compensation for the QA/QC Engineer role is between $75,000.00 and $95,000.00. Candidates with extensive experience may exceed this range. In addition to base salary, the role is eligible to receive discretionary bonus compensation based on individual and company performance.

At ARCO, our first core value is to treat people fairly and do the right thing. We are committed to building and sustaining a culture that supports diversity and inclusion. We are proud to be an equal opportunity employer, and all qualified applicants will receive consideration for employment.

From recruiting, training, and hiring practices to selecting our subcontractors, we understand that diversity of all those involved in the construction process enhances our ability to deliver the best solutions to our customers. We hire the best and the brightest from across the country – constructing a team of experts in architecture, design, engineering, project management, and business services.

MAKE YOUR MOVE

We are proud to be one of the fastest-growing, privately-owned companies in America, celebrating over 30 years of experience as design-build experts. We have completed over 7,500 design-build projects nationwide. We ranked #9 on ENR’s Design-Build Firms list and #34 on ENR's Top 400 Contractors list of 2026. Most importantly, our clients like us, trust us, and want to do business with us. We are looking for people with the same enthusiasm, passion, and respect for the hard work that brought us to where we are today. Are you a person who can make a difference at ARCO? If the answer is “Yes!” we look forward to meeting you.

As set forth in ARCO Companies’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

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A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

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