Operating Engineer 3rd Class

Amentum; Arlington (VA); On-site; USD 97,000 - 105,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

Paid time off and holidays

Retirement benefits including 401(k)

Educational reimbursement

Parental leave

Employee stock purchase plan

Tax-saving options

Disability and life insurance

Pet insurance

Job summary

Amentum is seeking an Operating Engineer 3rd Class in Arlington, VA to operate and maintain Central Plant equipment and building systems. This licensed engineer will perform preventive and corrective maintenance on boilers, HVAC systems, pumps, motors, generators, and electrical equipment.

The role requires a Secret clearance, a DC 3rd Class Boiler License, and at least 3 years in engineering services or related fields. Strong troubleshooting and the ability to read complex manuals are essential.

Qualifications

• Active Secret Security Clearance is required.
• DC 3rd Class Steam & Hot Water Boiler Engineer License is required.
• Minimum of 3 years in Engineering Services or related field.
• Experience operating and maintaining boilers, HVAC, and building mechanical/electrical equipment.
• Ability to read and interpret technical manuals, blueprints, and schematics.
• Strong troubleshooting and diagnostic skills; able to work independently or in a team.

Responsibilities

• Operate and maintain Central Plant equipment and building systems.
• Perform preventive, predictive, and corrective maintenance on boilers, HVAC, pumps, motors, generators, and electrical equipment.
• Troubleshoot mechanical and electrical issues and implement repairs.
• Monitor system performance for efficient facility operations.
• Inspect equipment and systems to identify maintenance needs and potential failures.
• Respond to malfunctions, alarms, and emergencies promptly.
• Maintain maintenance records and regulatory documentation.
• Ensure safety, regulatory compliance, and facility policies.
• Coordinate with management, contractors, and vendors for maintenance and repairs.
• Assist with equipment upgrades, renovations, and capital projects.
• Support training of less experienced engineering staff.

Skills

Boilers & HVAC operation

Electrical systems

Troubleshooting & diagnostics

Reading blueprints & schematics

Independent work & teamwork

Education

District of Columbia 3rd Class Boiler License

Tools

BAS

CMMS

Job description

Amentum delivers world-class solutions through the expertise, dedication, and collaboration of our people. We partner with our customers to solve complex challenges and are committed to fostering a workplace where employees can grow, succeed, and make a difference. We are currently seeking a Operating Engineer 3rd Class.

The Engineer - 3rd Class is a licensed engineering professional responsible for the operation, maintenance, troubleshooting, and repair of complex mechanical, electrical, and HVAC systems within a facility.

This position plays a critical role in ensuring the safe, efficient, and reliable operation of building infrastructure and Central Plant equipment.

The Engineer - 3rd Class possesses extensive technical knowledge of boilers, steam and hot water systems, HVAC equipment, electrical systems, and associated mechanical equipment. Working with a high degree of independence, the Engineer performs preventive and corrective maintenance, responds to equipment failures, and ensures compliance with all applicable safety regulations, codes, and operational standards.

Essential Duties and Responsibilities

• Operate, monitor, and maintain Central Plant equipment and building systems.
• Perform preventive, predictive, and corrective maintenance on boilers, HVAC systems, pumps, motors, generators, and electrical equipment.
• Troubleshoot mechanical and electrical issues and implement effective repair solutions.
• Monitor system performance to ensure efficient and uninterrupted facility operations.
• Conduct routine inspections of equipment and systems to identify maintenance needs and potential failures.
• Respond to equipment malfunctions, alarms, and emergencies in a timely manner.
• Maintain accurate maintenance records, operating logs, and regulatory documentation.
• Ensure compliance with all safety procedures, environmental regulations, and facility policies.
• Coordinate with facility management, contractors, and vendors as required to support maintenance and repair activities.
• Assist with equipment upgrades, renovations, and capital improvement projects.
• Support the training and development of less experienced engineering staff as needed.

Minimum Qualifications

• Active Secret Security Clearance (required).
• Valid District of Columbia 3rd Class Steam and Hot Water Heating Boiler Engineer License (required).
• Minimum of three (3) years of experience in Engineering Services, facilities engineering, building operations, or a related field.
• Demonstrated experience operating and maintaining boilers, HVAC systems, and complex building mechanical and electrical equipment.
• Working knowledge of applicable safety regulations, codes, and industry standards.
• Ability to read and interpret technical manuals, blueprints, and schematics.
• Strong troubleshooting, problem-solving, and diagnostic skills.
• Ability to work independently and effectively in a team environment.

Preferred Qualifications

• Experience working in government, mission-critical, healthcare, laboratory, industrial, or large commercial facilities.
• Familiarity with Building Automation Systems (BAS) and Computerized Maintenance Management Systems (CMMS).
• Experience with steam distribution systems, chilled water systems, and emergency power systems.

Compensation Details:

$97,000-$105,000

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement benefits (including 401(k) matching)
• Educational reimbursement
• Parental leave
• Employee stock purchase plan
• Tax-saving options
• Disability and life insurance
• Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting:

09/03/2026 - Until Filled

Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.