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3Rd Class Operating Engineer Jobs (NOW HIRING)

Pae

Lead Operating Engineer

Arlington, VA

$117K - $155K/yr

The Lead Engineer is a licensed 3rd Class Stationary Engineer with extensive experience operating, maintaining, troubleshooting, and repairing complex mechanical, electrical, and HVAC systems. This ...

JBG SMITH

Operating Engineer

Arlington, VA

$58.20/hr

Accepting applications for an operating engineer position in our Tenant Service Center (TSC), which ... Industry and trade licenses/certifications are a plus (such as a DC 3rd Class License). * Military ...

American University

Operating Engineer

Washington, DC · On-site

$37.25 - $41/hr

Operating Engineering 1 Time Type: Full time Job Type: Regular FLSA Status: Non-Exempt Work ... S. Diploma or equivalent. 3rd Class DC Steam Engineer's license (non-restricted) by the date of ...

American

Operating Engineer

Campus, IL · On-site

$37.25 - $41/hr

Operating Engineering 1 Time Type: Full time Job Type: Regular FLSA Status: Non-Exempt Work ... S. Diploma or equivalent. 3rd Class DC Steam Engineer's license (non-restricted) by the date of ...

Alutiiq

Chief Engineer

Arlington, VA · On-site

The Chief Operating Engineer is responsible for overseeing the safe and efficient operation ... S. State Stationary Engineers License Must hold a District of Columbia (DC) 3rd Class Steam ...

Dexterra

DC 3rd Class Engineer

Washington, DC · On-site

The DC 3rd Class Engineer is responsible for the safe and efficient operation and maintenance of all equipment at CMI's customer site in Washington, DC. Shift - Monday- Friday 2:00pm-10:00 Key Job ...

CMI Management

DC 3rd Class Engineer

Washington, DC · On-site

The DC 3rd Class Engineer is responsible for the safe and efficient operation and maintenance of all equipment at CMI's customer site in Washington, DC. Shift - Monday- Friday 2:00pm-10:00 Key Job ...

Dexterra

DC 3rd Class Engineer

Washington, DC · On-site

The DC 3rd Class Engineer is responsible for the safe and efficient operation and maintenance of all equipment at CMI's customer site in Washington, DC. Shift - Monday- Friday 2:00pm-10:00 Key Job ...

Koniag Services, Inc.

Operating Engineer

Charleston, SC · On-site

$65K - $88K/yr

The Operating Engineer will serve as a senior-level licensed professional responsible for the ... Valid 3rd Class Steam and Hot Water Heating Boiler Engineer license (DC jurisdiction) or ability to ...

Alutiiq

Facility Manager

North Charleston, SC · On-site

The Operating Engineer works under the direct supervision of the Chief Engineer and assumes the ... 3rd Class Steam and Hot Water Heating Boiler Engineer license Top Secret Security Clearance ...

kgs

Operating Engineer

Charleston, SC · On-site

$65K - $88K/yr

The Operating Engineer will serve as a senior-level licensed professional responsible for the ... Valid 3rd Class Steam and Hot Water Heating Boiler Engineer license (DC jurisdiction) or ability to ...

Koniag, Inc.

Operating Engineer

Charleston, SC · On-site

$65K - $88K/yr

The Operating Engineer will serve as a senior-level licensed professional responsible for the ... Valid 3rd Class Steam and Hot Water Heating Boiler Engineer license (DC jurisdiction) or ability to ...

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3rd Class Operating Engineer information

What is a 3rd class operating engineer?

3rd Class Operating Engineers are licensed professionals responsible for operating, maintaining, and monitoring boilers, engines, and other mechanical systems within industrial, commercial, or institutional facilities. They ensure that equipment runs safely and efficiently, often performing routine inspections, troubleshooting issues, and carrying out minor repairs. Their license typically allows them to work with specific types and sizes of equipment, as regulated by local or regional authorities. Advancement to higher classes of operating engineers generally requires additional experience and successful completion of further examinations.

What are the typical daily responsibilities of a 3rd class operating engineer in a commercial building setting?

As a 3rd Class Operating Engineer in a commercial building, your daily tasks often include monitoring, operating, and maintaining boilers, HVAC systems, and other mechanical equipment. You'll perform routine inspections, log equipment readings, and respond to alerts or malfunctions as they arise. Collaboration with senior engineers and building maintenance staff is common, especially when troubleshooting or during scheduled repairs. Staying organized and attentive to detail is essential, as safety and compliance with regulations are top priorities in this role.

What are the key skills and qualifications needed to thrive as a 3rd class operating engineer, and why are they important?

To thrive as a 3rd Class Operating Engineer, you need a solid knowledge of mechanical systems, boiler operations, and safety protocols, typically supported by a valid 3rd Class Operating Engineer license or certificate. Familiarity with equipment like HVAC systems, pressure vessels, and computerized building management systems is often required. Strong problem-solving skills, attention to detail, and effective communication help you respond to emergencies and coordinate with maintenance teams. These skills are crucial for ensuring safe, efficient, and compliant operation of complex building systems.

What is the difference between 3Rd Class Operating Engineer vs 2Nd Class Operating Engineer?

Aspect3Rd Class Operating Engineer2Nd Class Operating Engineer
CredentialsRequires a 3rd Class license, often with some work experienceRequires a 2nd Class license, more extensive experience and testing
Work EnvironmentOperates and maintains heating, cooling, and other mechanical systems in buildingsHandles more complex systems, often overseeing multiple equipment types
Employer & IndustryCommonly employed in commercial buildings, hospitals, and industrial facilitiesWorks in similar settings but with greater responsibilities and system complexity

The main difference between a 3rd Class Operating Engineer and a 2nd Class Operating Engineer lies in their licensing requirements, experience, and scope of responsibilities. A 2nd Class license allows for handling more complex systems and typically requires more extensive training and experience. Both roles are vital in maintaining building systems, but the 2nd Class Operating Engineer has a broader scope of work and higher qualifications.

How much does a 3rd class operating engineer make?

A 3rd class operating engineer in Ontario typically earns between CAD 50,000 and CAD 70,000 annually, depending on experience, location, and the specific employer. Certification and the ability to operate various mechanical systems can influence salary levels.
More about 3rd Class Operating Engineer jobs

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What states have the most 3Rd Class Operating Engineer jobs?

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For 3Rd Class Operating Engineer jobs, the most frequently searched job titles are:

3rd Class Operating Engineer jobs near you

Lead Operating Engineer

Arlington, VA

Pae
See more jobs at Paeexternal

$117K - $155K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 8 days ago

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 Lead Operating Engineer.

The Lead Engineer reports directly to the Chief Engineer and serves in the Chief Engineer's capacity when required. This position is responsible for the safe, efficient, and reliable operation of all Central Plant equipment and building mechanical systems. As the senior engineering professional on site, the Lead Engineer provides technical leadership, oversees engineering operations, and ensures compliance with all applicable safety regulations, codes, and operational standards.

The Lead Engineer is a licensed 3rd Class Stationary Engineer with extensive experience operating, maintaining, troubleshooting, and repairing complex mechanical, electrical, and HVAC systems. This individual works with a high degree of independence while providing guidance and oversight to junior engineering staff.

Essential Duties and Responsibilities
  • Operate, monitor, and maintain all Central Plant equipment to ensure optimum performance and reliability.
  • Act on behalf of the Chief Engineer during absences or as delegated.
  • Oversee the operation, maintenance, troubleshooting, and repair of boilers, HVAC systems, pumps, generators, electrical distribution systems, and associated equipment.
  • Ensure compliance with all safety regulations, environmental requirements, and facility operating procedures.
  • Perform preventive and predictive maintenance activities to minimize downtime and extend equipment life.
  • Respond to equipment failures and emergency situations, diagnosing issues and implementing corrective actions.
  • Maintain accurate operational logs, maintenance records, and regulatory documentation.
  • Coordinate and oversee work performed by contractors and vendors as required.
  • Provide technical guidance, training, and support to engineering staff.
  • Assist with planning and implementing facility improvement projects and equipment upgrades.
  • Support mission-critical operations by ensuring continuous and efficient plant performance.
Minimum Qualifications
  • Active Secret Security Clearance (required).
  • Valid District of Columbia 3rd Class Steam and Hot Water Heating Boiler Engineer License (required).
  • Minimum of five (5) years of experience in Engineering Services, facilities engineering, central plant operations, or related industrial/mechanical environments.
  • Demonstrated experience operating and maintaining boilers, HVAC systems, and other complex building mechanical and electrical equipment.
  • Strong knowledge of applicable safety practices, regulations, and industry standards.
  • Ability to diagnose equipment issues and perform complex repairs independently.
  • Strong communication, leadership, and organizational skills.
Preferred Qualifications
  • Experience working in mission-critical, government, healthcare, laboratory, or large commercial facilities.
  • Previous supervisory or lead engineering experience.
  • Familiarity with building automation systems (BAS) and computerized maintenance management systems (CMMS).

Compensation Details:

$109,000-$115,000

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 atLabor Laws Posters.

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