- Company: Cfs Energy
- Location: Devens, Massachusetts
- Salary: Pay not listed
Cfs Energy at a glance
Commonwealth Fusion Systems (listed here as Cfsenergy) is commercializing fusion energy from Devens, Massachusetts. Recent coverage includes an AI collaboration with Siemens and NVIDIA, a Google partnership, an $863M Series B2, and plans for a commercial plant in Virginia.
Senior Manager, Mechanical Engineering — Vacuum Vessel | Cfsenergy | Devens, Massachusetts | Full Time | No Remote
The Opportunity
We are seeking a creative and experienced mechanical engineering manager to lead the design and delivery of the ARC vacuum vessel. As part of our mission to deliver urgent transition to fusion energy, you will play a crucial role in designing a critical component of the world's first fusion power plant. The vacuum vessel is a hundred-ton mechanical structure that surrounds the fusion plasma, 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. Additionally, it must be replaceable via a remote handling system during regular maintenance cycles.
Day-to-Day Responsibilities
- Lead the design and delivery of the ARC vacuum vessel within the ARC tokamak
- Collaborate with cross-functional teams to ensure successful integration of the vacuum vessel into the overall plant design
- Ensure compliance with all safety, quality, and regulatory requirements
- Manage project timelines and budgets for the vacuum vessel development
- Mentor and lead a team of mechanical engineers in their professional growth
Who We're Looking For
We are looking for an experienced mechanical engineering manager with a proven track record in leading complex design projects. You should have a deep understanding of vacuum vessel design, experience in fusion energy or related industries, and a strong background in mechanical engineering principles. A Master's degree in Mechanical Engineering is preferred. Additionally, you must possess excellent leadership skills, the ability to manage multiple projects simultaneously, and a commitment to innovation and continuous improvement.
About Cfsenergy
Commonwealth Fusion Systems (CFS) is on a mission to deliver the urgent transition to fusion energy by combining decades of research, top talent, and new technologies. Since 2018, we've raised $4 billion in capital, making us the largest and leading fusion company in the world. Now, we're looking for thinkers, doers, builders, and makers to join us. People who will bring new perspectives, solve tough problems, and thrive as part of a team.
How to Apply
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You’ll finish your application on the employer’s website. We don’t ask for a resume on this page.
Explore Cfs Energy online
What people say about Cfs Energy
No employee-review scores appear in the data. Public signal is mostly Hacker News hiring threads (e.g. Dec 2024, Aug 2024) plus fusion-career discussion—not workplace ratings.
- Ask HN: Who is hiring? (December 2024)
- Ask HN: Who is hiring? (August 2024)
- Ask HN: What would it take to go from 0 to contributing to fusion research?
- Ask HN: Who is hiring? (September 2022)
Recent news
- Commonwealth Fusion Systems Accelerates Commercial Fusion With Siemens and NVIDIA, Leveraging AI-Powered Digital Twins - Commonwealth Fusion Systems
- Commonwealth Fusion Systems Raises $863 Million Series B2 Round to Accelerate the Commercialization of Fusion Energy - Commonwealth Fusion Systems
- Commonwealth Fusion Systems to Build World’s First Commercial Fusion Power Plant in Virginia - Commonwealth Fusion Systems
- Google and Commonwealth Fusion Systems Sign Strategic Partnership - Commonwealth Fusion Systems
- ARC: Putting fusion energy on the grid - Commonwealth Fusion Systems
Aggregated from public discussions and news; opinions are the authors’ own.
Working in Devens, Middlesex County
Weather right now in Devens, Middlesex County: checking… · Local time: · Air quality: · Daylight: · UV index: · Wind: · Pollen:
Devens, Massachusetts is a former Fort Devens site now a regional enterprise zone spanning Ayer, Shirley, and Harvard (~1,700 residents). On-site work in Massachusetts’ Middlesex County, not remote.
Massachusetts, officially the Commonwealth of Massachusetts, is a state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode Island to its south, New Hampshire and Vermont to its north, and New York to its west. Massachusetts is the seventh-smallest state by land area. With an estimated population of ove
Cost of living in Massachusetts: 5.8% above the national average — via BEA
Minimum wage in Massachusetts: $15.00/hr — via FRED
Real GDP per capita in Massachusetts: $90,044 — via FRED
Home prices in Massachusetts (year over year): +4.2% — via FRED
Average commute time in Middlesex County: 30 min — via US Census ACS / Data USA
Most common commute in Middlesex County: Drove Alone (54%) — via US Census ACS / Data USA
Households with home internet in Middlesex County: 95% — via US Census ACS / Data USA
Typical climate: average high 60°F / low 37°F year-round (summers around 82°F, winters around 17°F) — via NOAA 1991-2020 Normals
- Elevation 82m (269 ft)
Source: Wikipedia (state)
Be ready on vacuum-vessel mechanics: structural/thermal loads, leak-tight joints, materials for vacuum/radiation, ASME or similar design rigor, and how you led multi-discipline teams from concept through build.
Strong fit if you have managed mechanical design of large vacuum or pressure-boundary hardware and want hands-on leadership in commercial fusion at Devens.
Job details above are provided by the employer/source. The sections on this page are compiled from public data sources with AI assistance.
Accommodations: if you need a workplace accommodation to apply for or perform this job, see ADA.gov or EEOC.gov for guidance on your rights and how to request one.
Listing facts
- Role Senior Manager, Mechanical Engineering — Vacuum Vessel
- Employer Cfs Energy
- Location Devens, Massachusetts
- Type Full Time
- Pay (from listing) Pay not listed
- Posted August 24, 2026
- Apply by September 23, 2026
- Overview Full job description on this page (358 words)
Facts above come from this job record on Get A Job.AI — not copied from third-party review sites.
Public discussions & open sources
Attributed public threads and profiles — not employee reviews or star ratings.
- Hacker News — Ask HN: Who is hiring? (December 2024)
- Hacker News — Ask HN: Who is hiring? (August 2024)
- Hacker News — Ask HN: What would it take to go from 0 to contributing to fusion research?
- Hacker News — Ask HN: Who is hiring? (September 2022)
Cached public sources (Hacker News, Dev.to, GitHub, etc.).
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6 other opening(s) at Cfs Energy on Get A Job.AI
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