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Senior Manager, Mechanical Engineering — Vacuum Vessel
Job Location:
Job Location:
Devens, MA - USA
Yearly Salary:
$ 150000 - 225000
Yearly Salary:
Posted:
26 August 2026 (4 days ago)
Posted:
Application Deadline:
23 November 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
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 were designing and building commercially viable fusion power plants. And were working with policymakers suppliers and many others to build the energy industry of the future.
Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading fusion company in the world.
Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.
If thats you and this role fits we want to hear from you.
Join the power movement as a Senior Manager Mechanical Engineering
CFS is looking for a creative experienced mechanical engineering manager to lead the design and delivery of the ARC vacuum vessel. Commonwealth Fusion Systems is currently designing the ARC fusion power plant. Within the ARC plant the ARC tokamak consists of many large mechanical structures that support the large loads and extreme conditions of the fusion plasma. One of the newest and most interconnected components in ARC will be the vacuum vessel a hundred-ton mechanical structure that surrounds the fusion plasma. This structure must withstand extreme heat fluxes on the plasma-facing side and effectively remove this heat via flowing molten salt on the other side of the vessel. This vessel must also be replaceable via a remote handling system during regular plant maintenance cycles. Come lead the design of a critical portion of the worlds first fusion power plant!
What youll do:
- Lead a team of mechanical engineers to plan and deliver on the ARC vacuum vessel and connected systems
- Oversee the full design lifecycle from initial concept and CAD modeling to hardware procurement and assembly
- Interface the design of the vacuum vessel with many other systems in the ARC plant coordinating with other engineering teams to ensure the best overall design for the product
- Provide hands-on technical leadership to solve complex multi-disciplinary design challenges and manage risks in new environments and with novel materials
- Work with the supply chain and materials and processing teams to identify and develop suppliers for the vacuum vessel
- Proactively manage schedule and budget to deliver a critical component to the ARC fusion power plant
- Manage all aspects of the groups talent including hiring training and setting clear performance expectations
- Promote a culture of resilience and grit ensuring the team consistently follows through on assignments despite technical hurdles
What were looking for:
- Bachelors Degree in Mechanical Engineering or a closely related degree
- 10 years experience in mechanical engineering or closely related fields
- Experience working on a multi-disciplinary engineering project
- Experience designing and delivering largemetallic structures
- Experience with structural analysis
- Experience with fabrication of complex large structures
- Experience working in dynamic R&D environments including novel materials and locations
- Broad knowledge of engineering sufficient to interact with multi-disciplinary engineering teams
- Knowledge of finite element structural analysis
- Knowledge of fluid cooling of mechanicalstructures
- Ability to adapt to a rapidly changing environment
Bonus points for:
- Experience designing systems operating at high temperature (600C / 1100F)
Must-have requirements:
- Perform activities such as 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
$150000 - $225000 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
#LI-Onsite
At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were 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.
Required Experience:
Senior Manager
