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Mechanical Engineer

Commonwealth Fusion Systems

Devens, MAFull-time$107–160K/yrPosted todayStill listed today

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At a glance

Compensation
$107–160K/yr
Location
Devens, MA
Schedule
Full-time
Work Authorization
Not specified

Olive lists jobs from US employers, including remote roles you can work from the United States.

Requirements

Credentials this posting asks for.

Bachelor's degree

Job overview

Commonwealth Fusion Systems is seeking a Mechanical Engineer for its manufacturing team to support commissioning, implementation, and integration of manufacturing equipment. The role works with production and engineering teams to improve equipment performance and manufacturing processes, and includes partial or full second-shift coverage. The engineer will also support acceptance testing, equipment design, troubleshooting, and process experiments.

Skills & qualifications

RequiredNice to have

Skills

Mechanical EngineeringComputer-Aided DesignFactory and Site Acceptance TestingGeometric Dimensioning and TolerancingProblem SolvingAnalytical ThinkingInterpersonal CommunicationsMechanical SystemsHydraulicsPneumaticsMotion Control3D CAD2D DrawingsFactory Acceptance TestingSite Acceptance TestingGD&TAnalytical SkillsCommunicationInterpersonal SkillsCross-Functional CollaborationCommissioningEquipment StartupManufacturing Process OptimizationAutomated EquipmentRoboticsLifting 50 LbsTypingStandingStoopingSittingTravelNight and Weekend WorkOn-Call Availability

Qualifications

Bachelor's in Mechanical Engineering or Related5+ Years Mechanical Engineering Experience3+ Years Equipment and Tooling Design

Benefits

Paid Time Off
Parental Leave
Medical Insurance
Dental Insurance
Vision Insurance
401(k) Match

Full job description

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Mechanical Engineer We are seeking a highly motivated and experienced Mechanical Engineer to join our manufacturing team. In this role, you will be responsible for providing technical expertise during the commissioning, implementation, and integration of manufacturing equipment. You will work closely with our production team to ensure that our manufacturing processes are optimized for efficiency, quality, and safety. Additionally, this position requires coverage or partial coverage for the second shift, as well as support for Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment.

What you'll do:

  • Provide technical expertise during the commissioning, implementation, and integration of manufacturing equipment
  • Support Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment
  • Troubleshoot mechanical issues and provide solutions to ensure equipment operates efficiently
  • Collaborate with production and engineering teams to optimize manufacturing processes and improve equipment performance
  • Drive continuous improvement initiatives for manufacturing equipment to increase efficiency, reduce downtime, and improve quality.
  • Conduct root cause analysis and implement corrective actions to resolve manufacturing issues
  • Proficient with 3D CAD software
  • Ensure compliance with all safety requirements
  • Create and maintain Process and Instrumentation Diagrams (P&IDs)
  • Understand and apply Geometric Dimensioning and Tolerancing (GD&T) principles
  • Work with external vendors and suppliers to ensure the timely delivery of equipment and materials
  • Conceptualize and detail new manufacturing equipment for scaled up manufacturing processes
  • Run experiments to determine the feasibility of new manufacturing processes and translate those learnings into practical designs

What we're looking for:

  • Bachelor's degree in Mechanical Engineering or a related field
  • 5+ years of experience in mechanical engineering, with a focus on manufacturing equipment
  • 3+ years of manufacturing equipment and tooling design
  • Strong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control
  • Experience with 3D CAD packages and 2D drawings
  • Experience with Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment
  • Understanding of GD&T and its application
  • Excellent problem solving and analytical skills
  • Strong communication and interpersonal skills, with the ability to collaborate effectively with cross-functional teams
  • Experience with commissioning and startup of manufacturing equipment

Bonus points for:

  • Strong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control
  • Experience with production ramp-up and optimization of manufacturing processes
  • Experience with automated equipment and robotics

Must-have requirements:

  • Ability to lift up to 50 lbs occasionally
  • Perform activities such as typing, standing, stooping, and sitting, for extended periods of time
  • Willingness to occasionally travel or work required nights/weekends/on-call
  • Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics

#LI-Onsite

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

107000 - 160000 USD a year

Salary range for this full-time position + equity + benefits. The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations.

Benefits include:

  • Competitive compensation with equity
  • 13 Company-wide Holidays
  • Flexible vacation days
  • 10 sick days
  • Generous parental leave policy
  • Health, dental, and vision insurance
  • 401(k) with employer matching
  • Professional growth opportunities
  • Team-building activities

How this job compares

Set against the 7,534 open Mechanical Engineer jobs on Olive Jobs, counted October 29, 2026.

Pay
  • This posting$107–160K/yr
  • Massachusetts median$108–165K/yr210 salary ranges
  • US median$106–160K/yr4,505 salary ranges

This range's midpoint, $134K, is 4% below the Massachusetts median midpoint ($139K) — in the middle half of Mechanical Engineer salary ranges in Massachusetts.

Openings
Olive Jobs lists 267 open Mechanical Engineer jobs in Massachusetts and 7,534 across the US. 2% of them nationwide are listed as remote or flexible.
Hiring the most in Massachusetts
Experience
This posting asks for at least 5 years of experience; Mechanical Engineer postings that state a minimum ask for 5 years at the median (6,231 postings).
Education
This posting asks for a bachelor's degree; 5,295 of the 7,534 open Mechanical Engineer jobs (70%) ask for a bachelor's degree or higher.

Counted across the open, public US postings on Olive Jobs on October 29, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.

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