SECTION I · THE BRIEF
Brief #44166Updated 28 OCT 2026DEVENS, MALeverKHOSLA VENTURES
Employbl Company Profile

Mechanical Engineer

Commonwealth Fusion Systems (CFS) is an American company founded in 2018 aiming to build a compact nuclear fusion power plant based on the ARC tokamak reactor concept. The company is based in Cambridge, Massachusetts,…

Location
Devens, MA
Company size
500–2,000
Posted
Yesterday
Via
Lever
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Job title
Mechanical Engineer
Job location
Devens, MA
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
  • View job listing ↗
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    Commonwealth Fusion Systems headquarters

    Cambridge, MA

    Company size

    500–2,000 employees

    Founded

    2018

    Total raised

    $3,877,000,000

    View company profile ↗

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    Funding rounds