Principal Mechanical Engineer

Principal Mechanical Engineer

Johnson Service Group (JSG) is actively searching for a Principal Mechanical Engineer for our client’s operation near Denver, CO. This is a long-term contract position with competitive pay. This is a fantastic opportunity to work on a state-of-the-art project.

The Principal Mechanical Engineer is a senior technical leader responsible for the design, specification, and delivery of mechanical systems within EPC (Engineering, Procurement, and Construction) projects. This role focuses heavily on rotating equipment, pressure vessels, and other major mechanical equipment, ensuring designs meet project requirements, industry standards, and client expectations. The position also plays a key role in cross-functional coordination.

Key Responsibilities

• Lead the mechanical engineering scope for EPC projects from concept through execution

• Design, specify, and review rotating equipment (pumps, compressors, turbines), pressure vessels and other major mechanical equipment.

• Ensure compliance with applicable codes and standards (ASME, API, etc.)

• Collaborate closely with process engineering to understand operating conditions and translate them into mechanical design requirements

• Interface effectively with other mechanical engineers and multidisciplinary teams (process, piping, electrical, project management)

• Review vendor drawings, datasheets, and technical bids for accuracy and compliance

• Provide technical guidance, mentorship, and quality oversight to junior and mid-level engineers

• Support procurement, construction, and commissioning phases as needed

• Troubleshoot complex mechanical issues and provide practical, cost-effective solutions

Qualifications

• Bachelor’s degree in Mechanical Engineering

• Professional Engineer (PE) license required (Colorado), with ability to obtain licensure in additional states preferred

• 15+ years of experience in an EPC or similar project-based environment

• Strong experience with rotating equipment and pressure vessels

• Solid understanding of process conditions (pressure, temperature, flow, materials) and their impact on mechanical design

• Proven ability to work across disciplines and communicate with both technical and non-technical stakeholders

• Experience reviewing and approving engineering deliverables and vendor documentation

JSG offers medical, dental, vision, life insurance options, short-term disability, 401(k), weekly pay, and more. Johnson Service Group (JSG) is an Equal Opportunity Employer. JSG provides equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, age, sexual orientation, gender identity, national origin, disability, marital status, protected veteran status, or any other characteristic protected by law.

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About the Company:

Johnson Service Group

At JSG, We Understand People

It is our mission to empower people, help our clients reach their goals, and hire motivated individuals.

Since our start in 1984, we’ve worked hard to establish our present position as the most effective cross-industry staffing and consulting solution available.

Headquartered in Chicago, IL with local offices throughout the United States and Canada, JSG proudly serves a diverse range of industries with the right solutions to help clients reach their company goals. Our client-centric approach enables us to create personalized solutions for businesses in need of top-tier talent. Our dedication doesn’t stop at our clients. We strive to connect candidates with opportunities that match their skills and goals. More than just a go-between, we are a dependable bridge, uniting top talent with suitable opportunities, facilitating shared opportunities and growth.

Company Size:

1,000 to 1,499 employees

Industry:

Staffing/Employment Agencies

Founded:

1984

Website:

https://www.jsginc.com/