Commonwealth Fusion Systems

Manager, Field Mechanical Engineering - Assembly

Join Commonwealth Fusion Systems in Devens, Massachusetts as Manager, Field Mechanical Engineering - Assembly. Lead a team overseeing complex fusion power plant assembly processes, ensuring smooth operations and problem-solving. Enjoy competitive pay, equity, flexible vacation, and comprehensive benefits in a mission-driven environment.
Commonwealth Fusion Systems
Commonwealth Fusion Systems
Devens, Massachusetts, United States On-site Full time USD 110k–185k yearly UTC-05:00

Commonwealth Fusion Systems

Company Overview

Commonwealth Fusion Systems (CFS)

Cambridge, MA, United States

2018

Approximately 430 employees (source: zoominfo.com). Revenue figures vary, with reports indicating $211.3 million or $31.7 million, though as a pre-revenue fusion developer focused on R&D, these may reflect funding or operations rather than sales.

What They Do

Commonwealth Fusion Systems (CFS) is a pioneering private fusion energy company that specializes in tokamak-based magnetic confinement fusion. Founded as a spinout from MIT's Plasma Science and Fusion Center, CFS focuses on utilizing high-temperature superconducting magnets to achieve commercial net energy production (source: cfs.energy). The company has made significant strides in its technology, particularly with the development of compact fusion machines that leverage decades of tokamak science. Their flagship projects, SPARC and ARC, aim to demonstrate net energy gain and commercial viability in the coming years (source: cfs.energy).

Projects & Track Record

CFS is currently engaged in several groundbreaking projects, most notably the construction of SPARC, which is set to be the world's first net-energy fusion machine. Located at their Fusion Energy Campus in Devens, Massachusetts, SPARC aims to demonstrate net energy gain by the late 2020s (source: cfs.energy). Additionally, CFS is planning the ARC project, a 400 MW-class grid-scale tokamak power plant designed for commercial deployment in the early 2030s. These projects are underpinned by significant technological advancements, including the successful testing of the central solenoid magnet module (CSMC) in November 2024, which confirmed the manufacturability of critical components for SPARC (source: zoominfo.com).

Recent Developments

In the past two years, CFS has made remarkable progress, including the opening of its Devens Fusion Energy Campus on February 10, 2023, which was attended by notable figures such as U.S. Secretary of Energy Jennifer Granholm (source: cfs.energy). The company has also secured substantial funding, raising $863 million in August 2024, building on a previous $1.8 billion round in May 2023, bringing total funding to over $2 billion (source: wbjournal.com). Furthermore, CFS announced its first commercial power plant site in Chesterfield County, Virginia, which will be independently financed and operated, with plans for grid connection in the early 2030s (source: zoominfo.com).

Working There

CFS offers a range of roles across various disciplines, including fusion science, engineering, manufacturing, and materials science. The majority of their workforce is based at the Devens campus, which has grown to over 430 employees (source: cfs.energy). The company culture emphasizes rapid execution and transparency, attracting top talent from the fusion and manufacturing sectors. Key executives include Co-Founder and CEO Bob Mumgaard, along with other leaders in operations and science, indicating a strong demand for expertise in tough tech and physics (source: nasdaqprivatemarket.com). While specific benefits are not detailed, the scale-up and investor backing suggest competitive packages for high-caliber roles in a mission-driven environment (source: cfs.energy). Job seekers are encouraged to monitor their careers page for openings related to SPARC and ARC advancements.


Last updated on Feb 23, 2026 | Report an issue

Job Description

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 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 Manager, Field Mechanical Engineering - Assembly

The Manager, Field Mechanical Engineering - Assembly is a hands-on leader accountable for the management, engineering oversight, and problem-solving of a subset of several complex and unique work stations of the SPARC assembly process. As lead you will ensure the assembly plan is thorough, tools are planned form, and the necessary procedures are robust in advance of assembly. Additionally the role will support the troubleshooting and related decision making involved with first time and repeat assembly work. As lead, the role 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. At the core, your role is to keep the assembly process for your area of ownership 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.

What you'll do

  • Lead a team of four to eight field mechanical engineers to plan and deliver on near to medium-term objectives for specific work stations within the SPARC Assembly Scope
  • Translate department-level strategy into actionable group objectives and manageable project timelines
  • Define and optimize field engineering workflows and internal standards to improve successful solution outcome rate and team efficiency
  • Oversee the full station scoping life cycle from predecessor/definition to tool and process implementation.
  • Establish and reinforce best practices for mechanical assembly, including standards for aligning, installation, and rework
  • Manage all aspects of the group's talent, including hiring, training, and setting clear performance expectations
  • Coach and mentor team members, actively contributing to their technical growth and professional career development
  • Build relationships across the organization to influence design direction and resolve technical conflicts with stakeholders
  • 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, Structural, Mechanical, or Aerospace Engineering B.S
  • 2+ years of Mechanical Engineering Experience demonstrating project ownership
  • 2+ years experience in management or oversight of an in-progress construction, manufacturing, or assembly/integration process.
  • 2+ years of experience with CAD software.

Bonus points for

  • 6+ years of Mechanical Engineering Experience demonstrating project ownership.
  • 4+ years experience in management or oversight of an in-progress construction, manufacturing, or assembly/integration process.
  • 3 years of experience with Siemens NX.
  • 2+ years of leading construction or assembly teams on complex assembly projects
  • 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.

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
  • Willingness to travel or work required nights/weekends/on-call occasionally for vendor visits during tool fabrication phases
  • 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

$110,000 - $185,000 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

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.

Apply now

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About the role

July 1, 2026

July 1, 2026

Full time

On-site

Company

USD 110k–185k yearly

Hydrogen

Commonwealth Fusion Systems

cfs.energy

  •  Devens, Massachusetts, United States

2+ years of Mechanical Engineering Experience

UTC-05:00