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Senior Mechanical Assembly Test Engineer

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 working with policymakers and suppliers to build the energy industry of the future. 


We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private 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 Senior Mechanical Assembly Test Engineer


The Senior Mechanical Assembly Test Engineer is responsible for the initiation, development, revision and execution support of the Mechanical Test procedure development process associated with the SPARC Assembly project initiative.


What you'll do:
  • Execute long term complex testing procedures performed in the field encompassing multiple disciplines and several stages based on project maturity and progress - mechanical test focus involving (but not limited to) code driven or guided leak and pressure testing initiatives including mass spectrometry leak detection methods
  • Collaborate with CFS Engineering groups to develop SPARC Assembly (SASY) in-situ test procedures
  • Serve as an test implementation expert for testing of assigned disciplines or tasks, provide guidance and instruction to cross functional groups within CFS
  • Identify potential issues pro-actively during the test planning and procedure development phase to ensure proper risk management and quality assurance of test results in a fast-paced environment
  • Provide in-field support during high risk test evolutions or simple / complex troubleshooting (leak testing, pressure testing, etc.)
  • Collaborate with internal teams / external vendors for test feature custom design & fabrication
  • Ensure that activities being performed in the field are being conducted in accordance with CFS Standards and regulatory standards (NEC, NFPA, ASME, ASTM, OSHA, etc.) or best industry practices
  • Adhere to the highest standards of safety and ensure that activities taking place under her or his oversight are being performed in strict accordance with CFS safety policies and applicable regulatory safety standards
  • Collaborate with CFS EHSS and CFS engineering teams to proactively identify risks and align mitigation requirements for all activities.  Participate in Risk Assessment activities and Root Cause Analysis as necessary


What we're looking for:
  • BS in Engineering or related field
  • 10+ Years Commissioning (similar and cross functional experience in operations or maintenance is acceptable) and/or testing experience
  • High proficiency Google documents, BlueBeam or Acrobat, and 3D modeling programs


Bonus points for:
  • Mechanical testing or commissioning experience
  • OSHA 10
  • NFPA 70E


Must-have requirements:
  • Ability to occasionally lift up to 50 lbs
  • Perform activities such as stooping, climbing, typing, standing, or sitting for extended periods of time
  • Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics
  • Willingness to occasionally travel to witness FAT at vendor locations worldwide.  May work second/third shifts and/or weekends as dictated by project needs


$110,000 - $185,000 a year
Salary range for this full-time position + equity + benefitsThe 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
•  12.5 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

#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.

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Average salary estimate

$147500 / YEARLY (est.)
min
max
$110000K
$185000K

If an employer mentions a salary or salary range on their job, we display it as an "Employer Estimate". If a job has no salary data, Rise displays an estimate if available.

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Full-time, onsite
DATE POSTED
November 6, 2025
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