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Principal Mechanical Engineer

Fermi Research Alliance, LLC
life insurance, paid time off
United States, Illinois, Batavia
PO Box 500 (Show on map)
Feb 25, 2026

The expected hiring range for this position is:

$124,800.00-$164,200.00.

Please note that the pay range information is a general guideline only. The pay offered to a selected candidate will be determined based on factors such the scope and responsibilities of the position, qualifications of the selected candidate, business considerations, internal equity, and external market pay for comparable jobs.

About the Role:
The Fermilab Infrastructure Services Division (ISD) is seeking a Principal Mechanical Engineer. This individual is responsible for major, complex, high-level engineering projects requiring engineering creativity in developing innovative concepts and techniques. The (ISD) Principal Mechanical Engineer leads and contributes to projects in areas such as design, design review, procurement, manufacture, installation, test, and initial operations of a project with extensive & diversified engineering requirements in compliance with all applicable local, state, and federal regulations, requirements and standards, and all Department of Energy (DOE) orders. This role may oversee sub-contractors or supervise/ manage an engineering group/department.

What your day-to-day as a Principal Mechanical Engineer at Fermilab will look like:

  • Analyze data and perform engineering calculations.
  • Develop specifications, designs, and documents for major and technically complex, high-level, and highly visible engineering projects and design solutions. Work involves a variety of complex and advanced engineering techniques.
  • Plan and/or lead large or complex projects from inception to completion and brings them to operating status. Estimates manpower, schedules work, coordinates and directs technicians.
  • Provide technical direction to draftsmen, designers, engineering associates, technicians, or less senior engineers. Coordinates and/or supervises technicians and other engineers and sub-contractors. May manage the activities of engineering groups or departments.
  • Identify problems or tasks requiring engineering solutions and provides a thorough analysis of alternatives.
  • Participate in procurement, as well as manufacture, installation, testing, and operation.
  • Assist or lead in the development of cost estimates, as well as the monitoring and/or management of budgetary obligations.
  • Review and approve work before hardware and financial resources are committed, ensuring conformance to specifications and cost/time constraints.
  • Enhance the national and international presence of projects or the Lab through participation in and collaboration on project reviews, as well as participation in technical conferences and publication.
  • Serve on safety panels, review committees, and other subcommittees as assigned. May serves as chair of subcommittee(s) or division/section committees.
  • Contribute to setting lab-wide engineering policies, safety standards or technical standards.
  • May provide supervision or leadership of a team including hiring, promotions, performance reviews, training, disciplinary actions, team exits, and other duties as assigned.
  • Perform other duties as assigned by supervisor.
  • Abide by and is responsible for performing all duties in accordance with all environmental, health and safety regulations and practices pertinent to this position.

Essential Skills and Competencies for Succes:

  • Bachelor's in an applicable Engineering discipline from an ABET accredited institution with 8+ years of engineering experience, or a Master's or PhD in an applicable Engineering discipline from an ABET accredited institution with 6+ years of engineering experience.

Applicable Knowledge, Skills and Abilities Required:

  • In-depth knowledge and proficiency in application of theories, concepts, principles, and methodology for the engineering discipline.
  • Possess extensive project planning skills in developing specifications and documents for major and technically complex, high-level, and highly visible engineering projects and engineering design solutions.
  • Ability to perform a variety of complex and advanced engineering techniques.

Work Arrangement:
Please note that the described work arrangement is subject to change based on business needs and is not guaranteed to be final.

  • Onsite: This is an onsite role, and the candidate must be able to work from our Batavia office.

Benefits/Perks:
Fermilab offers a competitive and comprehensive benefits program, including:

  • Medical, Dental, Vision and Flexible Spending Accounts
  • Paid time off
  • Life insurance
  • Short and Long-term disability insurance
  • Retirement benefits
  • Onsite day care

Why Fermilab:
Fermilab is America's premier laboratory for particle physics and accelerator research, funded by the U.S. Department of Energy. We support discovery science experiments in Illinois and locations around the world, including deep underground mines in South Dakota and Canada, mountaintops in Arizona and Chile, CERN in Europe and the South Pole.

Drug-Free Workplace & Pre-Employment Screening

Fermilab is dedicated to fostering a safe, productive, and drug-free work environment. As part of the hiring process, candidates must successfully complete a background check and drug screening. Employment is contingent upon the successful completion of these screenings.

Equal Opportunity Statement

Fermilab is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, age, national origin, disability, veteran status, genetic information, and other legally protected categories.

REAL-ID Requirement for access to Fermilab Campus
Fermilab requires all members of the public to produce a REAL-ID, or equivalent, to access the Fermilab Campus for interviews or career events. A list of acceptable forms of ID can be found here: https://get-connected.fnal.gov/wp-content/uploads/2021/09/REALID-Documents.pdf. If a candidate is selected for an interview but does not possess any of the equivalent documents, we may schedule a virtual interview.

What To Expect Next:
We'll be in touch! If your qualifications are in alignment with the position requirements, one of our recruiters will be reaching out to schedule a phone interview to learn more about your career interests and goals. In the meantime, we encourage you to check us out on Facebook, X, Instagram, LinkedIn, or our About Us page.

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