Senior Field Mechanical Engineer - Assembly
- Location
- Devens, MA · On-site
- Job type
- Full-time
- Level
- Lead / Staff
- Education
- Bachelor's degree
- Listed
- 14 days ago
Skills & highlights for this role
- Mechanical engineering
- Assembly process ownership
- Problem solving
- Tooling and fixture design
Also useful
- Large-scale precision assembly
- Metrology and precision alignment
- Design for manufacturing and assembly
- Hands-on fabrication
What you'll do
- Own and be the expert in the assembly sequence of your workstation (initially this role is scoped to the assembly of the Toroidal Field Coil (TF) semicircle sub-assemblies), with the responsibility to determine and enact acceptable solutions and changes to the sequence that both allow successful completion of the work-station but also fit with the entire SPARC assembly sequence
- Be responsible for new first-encounter work scope definition including the installation of various manifolds and magnet sub-assemblies
- Determine and execute solutions for identified assembly issues that arise, such as fit, method, or component handling problems. Work with the Tokamak System design teams to determine how a part or process step could be modified to work while also meeting functional requirements
- Proactively procure or build all tools, fixtures, or manipulation equipment required for the upcoming ports of the process in your workstation
- Serve as the extreme owner for a process by testing, implementing, and handing off to production technicians for repeated use for any given operation or tool(s)
- Provide design feedback to SPARC sub-system designs with a focus on manufacturing and assembly. Participate in both formal and informal design reviews to ensure what is delivered can be assembled
- Assist in the disposition and resolution of non-conformance issues on parts or the process, then working to incorporate and release red-line changes into an updated assembly sequence.
- Support hands on operations during Tokamak Assembly serving a variety of roles in the process
- Work with teammates in a collaborative fashion to receive feedback early and often to ensure all requirements are met. Many SPARC projects involve high loads, vacuum requirements, and complex manipulation requiring the involvement and review of adjacent sub system experts
What we’re looking for
- Civil, Mechanical, or Aerospace Engineering B.S.
- 7+ years of Mechanical Engineering Experience demonstrating project ownership
- 4+ years experience overseeing an in-progress construction, manufacturing, or assembly/integration process
- 4+ years of experience with CAD software
Bonus points for
- 3+ years of experience with Siemens NX
- Lifting operations experience
- Knowledge of welding
- Knowledge of piping and tubing construction and joining
- Experience with highly complex or delicate assemblies
- Experience with assembly or integration in tightly packaged spaces
- Experience with fast-paced and dynamic construction, manufacturing, or assembly/integration builds
- Design of simple yet sizeable alignment and positioning fixtures
- Heavy component manipulation and welding of large structures
Must-have Requirements
- Ability to occasionally lift up to 50 lbs
- Perform activities such as typing, standing, stooping, climbing or sitting for extended periods of time
- Required onsite 5 days/week when assembly operations with relevant tools are underway, with possible first or second shift assignment
- 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
Additional information
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.
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.
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 Field Mechanical Engineer - Assembly
As the Senior Field Mechanical Engineer on the Assembly Team at CFS, you will be responsible for the management, engineering oversight, and problem-solving of the most complex and unique work-stations of the SPARC assembly process.
You will be the central owner and know your part of the assembly process through-and-through, and you help guide the technicians through any issues that arise along the way, coming up with solutions that continue work and assembly moving forward. You will proactively ensure that they have all the tools required for the work, either procuring them off-the-shelf or quickly designing and building small tools and fixtures for use.
This also includes the close collaboration with adjacent teams on the Assembly Team, such as creating and incorporating the new process changes with the Assembly Process team, or providing the Metrology team with any assistance or tools needed for the precision alignment of coils and other key structures.
This role is on-site at Devens, MA but is a “field” role in the sense that you will be working day-to-day in the central construction hall in the CFS-2 facility where we are building the SPARC Tokamak.
At the core, your role is to keep the assembly process moving smoothly in any and all ways, managing the day-to-day changes in strategy or work orders, problem-solving and making tools, and using your engineering skills and knowledge to solve the many complex challenges that arise during the assembly process. You will guide and manage how the giant parts of this multi-million pound “Swiss-watch” come together!
Equal opportunity and legal notices
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.
From Commonwealth Fusion Systems's careers page, first listed on Rolev.ai on October 26, 2026. Rolev.ai is not the employer.
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All Commonwealth Fusion Systems jobsCommon questions
Where is the Senior Field Mechanical Engineer - Assembly job at Commonwealth Fusion Systems located?
This Senior Field Mechanical Engineer - Assembly position at Commonwealth Fusion Systems is located in Devens, MA (On-site). Always check Commonwealth Fusion Systems's application page for specific state eligibility or relocation policies.
What qualifications are required for Senior Field Mechanical Engineer - Assembly at Commonwealth Fusion Systems?
For the Senior Field Mechanical Engineer - Assembly role, Commonwealth Fusion Systems highlights a bachelor's degree; experience with Mechanical engineering, Assembly process ownership, Problem solving, Tooling and fixture design. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Senior Field Mechanical Engineer - Assembly position at Commonwealth Fusion Systems?
This listing links directly to Commonwealth Fusion Systems's Lever application page. You can apply directly on Commonwealth Fusion Systems's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Lever application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.