1,287,534open jobs
74,513companies
206,839added this week
Browse all
Salary
$111k – $147k per year
Location
In office (United States)
Seniority
Senior · 5+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 6, 2026. First seen by Alion on Sep 9, 2026. Fermilab scores B on the Alion truth index.

Overview
Company
Impact
Profile match

The expected hiring range for this position is:

$111,400.00-$146,600.00.

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 Senior Mechanical Engineer. This individual is responsible for upper-level engineering projects requiring engineering creativity in developing innovative concepts and techniques. The ISD Senior 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.

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

  • Analyzing data and performing engineering calculations. Developing designs of specific parts, components, or phases of a project.
  • Developing specifications, designs, and documents for major and technically complex engineering projects and design solutions. Work involves a variety of moderately complex engineering techniques.
  • Planning projects from inception to completion and brings them to operating status. Estimating manpower, scheduling work, coordinating and directing technicians.
  • Providing technical direction to draftsmen, designers, engineering associates, technicians, or less senior engineers. Coordinating and/or supervising technicians and other engineers, as assigned. May supervise an engineering/technical team or department, as assigned.
  • Researching and proposing solutions to engineering problems and provides analyses of alternatives to manager(s).
  • Participating in procurement, as well as manufacturing, installation, testing, and operation.
  • Assisting or leading in the development of cost estimates, as well as the monitoring and/or management of budgetary obligations.
  • Reviewing and approving work before hardware and financial resources are committed, ensuring conformance to specifications and cost/time constraints.
  • Providing and implementing changes in methods, design, or equipment in assigned area and contributes to the overall safety and completion of assignments.
  • Contributing to setting lab-wide engineering policies, safety standards or technical standards.
  • Serving on safety panels, review committees, and other subcommittees as assigned.
  • May participate in technical conferences and publication.
  • May provide supervision or leadership of a team including hiring, promotions, performance reviews, training, disciplinary actions, team exits, and other duties as assigned.
  • Performing other duties as assigned by supervisor.
  • Abiding by and being 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 Success:

  • Bachelor’s or Master’s in an applicable Engineering discipline from an ABET accredited institution
  • 5-10 years of engineering experience working at an MEP consulting firm.

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.
  • Experience with AutoCAD required. Experience with Revit is a plus.
  • Professional Engineer licensure is required. Licensure in State of Illinois is a plus.

The successful candidate will have experience in one or more of the following related areas:

  • Design of plumbing systems required
  • Working knowledge of building codes related to plumbing and mechanical systems required
  • Design of hydronic piping systems desired
  • Design of HVAC systems desired
  • Experience with energy modeling/HVAC software desired
  • Exposure to Building Commissioning desired
  • Familiarity with ASHRAE requirements and applications desired

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.

Pre-Employment Screening:

Drug-Free Workplace & Pre-Employment Screening

Fermilab is dedicated to fostering a safe, productive and drug-free environment. An offer of employment is contingent upon the successful completion of a background check and drug screening.

HSPD-12

In accordance with Homeland Security Presidential Directive 12 (HSPD-12) new employees are required to obtain and maintain a HSPD-12 Personal Identity Verification (PIV) Credential. To obtain this credential, new employees must successfully complete and pass a federal background check investigation. This investigation includes a declaration of illegal drug activities, including use, supply, possession, or manufacture. This includes marijuana and cannabis derivatives, which are still considered illegal under federal law, regardless of state laws. Failure to obtain or maintain such government access authorization could result in the withdrawal of a job offer or future termination of employment.

Foreign Government Sponsored Activities

Fermilab employees, and certain guest researchers and contractors, are subject to particular restrictions related to participation in Foreign Government Sponsored or Affiliated Activities, as defined and detailed in United States Department of Energy Order 486.1A. Such individuals will be asked to disclose any participation for review by Fermilab's Office of General Counsel.

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.

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.

Free account
Stop reading job ads. Get the ones that fit.
One free account turns this page into a shortlist built around your stack, your level and your pay.
Match on every job. Stack, seniority, pay and location, scored against your profile.
1,287,534 open roles. Read straight off company career pages, refreshed every day.
Unlimited applications. Every one you send is tracked in one place, on-site or on a company board.
3 tailored CVs a month. Rewritten for the exact job you are applying to. Included free.
Create a free account Continue with Google
Free forever. No card. Under a minute.

Your match

How well do you fit this role?
Two answers are enough for a real match. No account needed.
Check my fit
Answers stay in this browser until you create an account.

Recommended for you based on this role

Industrial Engineering
Similar stack
Same company
United States
≈ $72k – $139k per year (Estimated) • Equity • In office • Full-Time • 7+ years exp • Bachelor's Degree • Wichita
Analytics
Microsoft Excel
Management
Gmail
Apply
EDM Machinist II 1 hour ago
$56k – $64k per year • Equity • In office • Full-Time • 1+ year exp • High School Diploma • Buffalo
Apply
$139k – $160k per year • In office • Full-Time • 2+ years exp • Bachelor's Degree • Palo Alto
Python
C++
MATLAB
MATLAB
Simulink
AI/ML
Claude
DevOps
CI/CD
Git
Robotics
SLAM
Sensor Fusion
Inertial Navigation
Management
Agile
Apply
JSOC Supervisor 2 hours ago
$90k per year • In office • 4+ years exp • Bachelor's Degree • Redwood City
Cybersecurity
GDPR
Apply
≈ $62k – $114k per year (Estimated) • In office • Full-Time • 3+ years exp • Associate's Degree • Arlington Heights
Apply
Remote (likely United States) • Full-Time
Design
AutoCAD
Management
Microsoft Project
Outlook
SharePoint
Apply
$80k – $90k per year • Remote (likely United States, CT hours) • Full-Time
Analytics
Microsoft Excel
Design
AutoCAD
Apply
≈ $26k – $45k per year (Estimated) • In office • 1+ year exp • Singapore
Design
AutoCAD
Management
Microsoft Office
Apply
$76k – $114k per year • In office • 5+ years exp • Bachelor's Degree • United States
Design
AutoCAD
Management
Outlook
Apply
$34k – $38k per year • In office • Top Secret • Internship • United States
Design
AutoCAD
Apply
$111k – $147k per year • In office • Full-Time • 8+ years exp • Bachelor's Degree • United States
Design
AutoCAD
Apply
$89k – $117k per year • In office • Full-Time • 4+ years exp • Bachelor's Degree • United States
Design
AutoCAD
Apply
Mechanical Engineer 24 days ago
$100k – $131k per year • In office • Full-Time • 6+ years exp • Bachelor's Degree • United States
Apply
Cryogenic Engineer 3 months ago
$89k – $117k per year • In office • Full-Time • 4+ years exp • Bachelor's Degree • United States
AI/ML
Machine Learning
Apply
Lederman Fellow 6 days ago
$70k – $93k per year • In office • Full-Time • PhD • United States
Apply
$191k – $248k per year • In office • Full-Time • 10+ years exp • Bachelor's Degree • New York • Pittsburgh • Boston
Marketing
Salesforce
Apply
≈ $116k – $231k per year (Estimated) • Equity • In office • Full-Time • 3+ years exp • Bachelor's Degree • Houston
Python
SQL
Python
pySpark
Databases
Databricks
Delta Lake
Apache Kafka
Azure SQL Database
AI/ML
Spark
MLFlow
Scikit-learn
MLlib
TensorFlow
Keras
PyTorch
Ray
Machine Learning
DevOps
Rest API
Azure DevOps
Azure
CI/CD
Git
Kubernetes
Azure AKS
Analytics
ETL/ELT
Azure Data Factory
Apply
≈ $52k – $91k per year (Estimated) • Equity • In office • Full-Time • 3+ years exp • High School Diploma • United States
Apply
≈ $39k – $89k per year (Estimated) • Hybrid • Full-Time • United States
Apply
≈ $73k – $141k per year (Estimated) • In office • Full-Time • 4+ years exp • Bachelor's Degree • Charlotte
Analytics
Microsoft Excel
Management
Microsoft Office
Apply
See all jobs
This is one of many
1,287,534 more open roles from verified company boards, updated every day.