Senior Manager, Mechanical Engineering
On-site
Devens, MA
Full-time
Manager
Senior
10+ yrs
Salary not listedPosted 3d ago
Real job — pulled straight from CommonwealthFusion’s careers page · Verified August 29, 2026 · No reposts.
Job description
CommonwealthFusion is hiring a Senior Manager, Mechanical Engineering — a full-time, based in Devens, MA role. Apply directly on CommonwealthFusion's careers page below.
Senior Manager, Mechanical Engineering — Vacuum Vessel
Team: Mechanical Engineering
Location: Devens, MA
Commitment: Full-time
Workplace Type: onsite
Salary:
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
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 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 world's first fusion power plant!
What you'll 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 group's 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 we're 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 large metallic 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 mechanical structures
- 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
#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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Frequently asked questions
What skills are required for Senior Manager, Mechanical Engineering at CommonwealthFusion?
The required skills for Senior Manager, Mechanical Engineering at CommonwealthFusion include: Mechanical Engineering, Project Management.
What is the seniority level for Senior Manager, Mechanical Engineering at CommonwealthFusion?
Senior Manager, Mechanical Engineering at CommonwealthFusion is a Manager / Senior level position.
How do I apply for Senior Manager, Mechanical Engineering at CommonwealthFusion?
You can view the full description and apply for Senior Manager, Mechanical Engineering at CommonwealthFusion on EchoJobs: https://echojobs.io/job/commonwealthfusion-senior-manager-mechanical-engineering-vacuum-vessel-fps7g.