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Staff Mechanical Engineer - Remote Maintenance

Join Commonwealth Fusion Systems in Devens, Massachusetts as a Staff Mechanical Engineer focusing on remote maintenance for ARC, the first commercial fusion power plant. Lead design of remote handling equipment and collaborate across teams to enable reliable, remote plant upkeep. Enjoy competitive pay, equity, flexible vacation, and comprehensive benefits.

Remote Full time UTC-05:00 Updated today
Salary
US$130,000–200,000 /year

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CFS is designing ARC as the world's first commercial fusion power plant with the goal of bringing reliable and clean fusion energy to the grid. Due to device activation and commercial uptime needs, ARC will need periodic, fast, and reliable maintenance to be performed fully remotely. This will require novel solutions and integration in the fields of robotics, remote handling equipment (RHE), plant layout, manufacturing, and tokamak design. ARC's Remote Maintenance System will thus be a critical aspect of realizing CFS's mission to deliver the urgent transition to fusion energy.

The Remote Maintenance team is responsible for designing ARC's Remote Maintenance System. As a Staff Remote Maintenance Engineer on the team, you will develop ARC's maintenance scheme by designing RHE and collaborating with tokamak and plant engineering teams in the design of a maintainable power plant. You will play a key role in ARC's pre-conceptual design phase along with other teams and navigate complex multi-disciplinary problems involving physics, neutronics, thermo-fluids, structures, maintenance, manufacturing, assembly, techno-economics, and other disciplines. This role also requires proactive R&D in novel remote maintenance technologies.

What you'll do

  • Lead the development and strategic execution of the operations for the ARC Remote Maintenance System
  • Drive the conceptual design process of the ARC fusion power plant, providing expert technical guidance for cross-functional teams
  • Lead the design of ARC's radiation hardened remote handling equipment (RHE) by incorporating a mix of existing robotic technologies, custom hardware, and remotely operated heavy lift equipment
  • Perform expert-level maintenance assessments of the tokamak and plant to shape the development of ARC as a remotely maintainable power plant, defining processes that impact direct work and identifying/mitigating significant long-term risks
  • Collaborate closely with tokamak engineering teams to assist in designing the ARC tokamak for remote maintainability and finding creative and novel solutions for tokamak joints
  • Perform high level multi-disciplinary trade studies of solutions that involve complex and ambiguous us tradeoffs between physics, neutronics, mechanical, thermo-fluids, electrical, maintenance, materials, manufacturing, techno-economics, and other disciplines
  • Lead multiple teams and manage projects to solve tough multi-disciplinary problems by resolving conflicts and driving key decisions across teams
  • Define and own the key R&D strategy needed for the ARC remote maintenance program, and help establish/direct the plans for executing the R&D campaigns internally or with external partners
  • Research established and cutting-edge remote handling solutions to assess their application in the ARC remote maintenance system to influence strategic shifts and novel approaches to improve performance, reduce cost, and increase reliability
  • Work with external RHE/robotics organizations and general industry to manage contracted work, collaborate on cutting edge R&D, and transfer knowledge and expertise into CFS
  • Establish CFS's remote maintenance design principles for RHE, the Tokamak, and plant, while propagating best practices and actively taking ownership of the growth and development of junior and peer engineers

What we're looking for

  • Structural, Mechanical, or Aerospace Engineering B.S
  • At least 10 years of mechanical engineering experience in the design, fabrication, testing, operations, integration, and commissioning of complex mechanical structures (e.g. fusion, fission, aerospace, marine)
  • At least 10 years of technical experience in the design of remote handling equipment (RHE) using robotics or remotely operated precision mechanical structures (e.g. remote welding/cutting, manipulation, alignment, rescue, inspections)
  • Proven track record of driving R&D campaigns of novel technology to increase TRL and unlock new design solutions in remote maintenance fields such as remote welding/cutting, inspections, bolting, manipulation, alignment, sensing, mechatronics, rad hard, and cleanliness
  • Deep expertise with standard actuation, guidance mechanisms, sensing, and structural mechanisms
  • Expertise in structural analysis via both hand calcs and finite element analysis (Ansys preferred)
  • Familiar with CAD, (NX preferred)
  • Ability to effectively lead a multidisciplinary team of engineers, scientists, technical staff, executives, and others
  • Ability to clearly communicate highly complex concepts to diverse audiences and build consensus
  • Safety conscious

Bonus points for

  • Structural, Mechanical, or Aerospace Engineering M.S
  • Experience operating with near-complete independence to drive conceptual design of complex systems involving high level, multi-disciplinary trade studies of both RHE and machine design (e.g. tokamak, fission core, sub-sea hardware, aerospace)
  • Experience with the implementation of radiation hardened equipment and methods into RHE design
  • Experience with mechatronics or applied robotics
  • Experience with rescue or decommissioning RHE
  • Experience with site layout design of remotely operated facilities
  • Experience with activated waste handling (volume reduction, casking)
  • Experience with remote cleanliness methods for UHV environments
  • Experience with industrial maintenance facility layout
  • Familiarity with basics of sensing, high power, controls, and fluid systems
  • Familiarity with ultra high vacuum processes
  • Experience with fault tree analysis or fault management and recovery for complex integrated systems
  • Knowledge of fabrication methods such as welding and machining
  • Knowledge of engineering materials basics for metals and composites
  • Proficient in CAD (NX preferred)
  • Self-driven and autonomous, capable of managing ambiguous assignments with loosely-defined outcomes
  • Aptitude to use data to drive decisions
  • Familiarity and experience with end-to-end processes with an emphasis on creativity and simplicity
  • The ability to thrive in fast-paced, dynamic environments

Must-have Requirements

  • Perform activities such as typing and sitting for extended periods of time
  • Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
  • Willingness to travel or work required nights/weekends/on-call occasionally. Travel expected up to 15%

$130,000 - $200,000 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.

Pay & benefits

US$130,000–200,000 /yr
Health insurance Dental insurance Vision insurance Retirement plan Equity Paid time off Parental leave

About this role

Posted
23 Sep 2026
Updated
23 Sep 2026
Job type
Full time
Workplace
Remote
Working hours
UTC-05:00
Experience
10+ years

About Commonwealth Fusion Systems

Company Overview

Name

Commonwealth Fusion Systems (CFS)

Headquarters

Cambridge, MA, United States

Founded

2018

Size

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.

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Staff Mechanical Engineer - Remote Maintenance
Commonwealth Fusion Systems · US$130,000–200,000/yr