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Assistant General Counsel - Commercial

Join Commonwealth Fusion Systems in Devens, Massachusetts as Assistant General Counsel - Commercial. Lead complex commercial deals, build legal infrastructure, and shape a new fusion energy industry. Enjoy competitive pay, equity, and comprehensive benefits in a mission-driven environment.

On-site Full time UTC-05:00 Updated today
Salary
US$250,000–300,000 /year

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CFS is seeking an experienced, pragmatic, and highly strategic Assistant General Counsel - Commercial to serve as a foundational leader on our legal team. This is a rare opportunity to shape how legal operates at a company building an entirely new industry from the ground up.

This role is a true n of 1: you will be the company's dedicated commercial legal lead, operating as both a hands-on individual contributor on CFS's most complex, mission-critical transactions and the architect of the legal infrastructure that will support the company's next phase of commercial growth. As CFS scales, you will be expected to build and lead a team in commercial and corporate legal, making this as much a leadership opportunity as a technical legal one.

Reporting directly to the Chief Legal Officer, you will partner with executive leaders across commercial and business development, corporate development, strategic partnerships, supply chain, finance, and engineering - giving you direct visibility into, and influence over, the company's most consequential strategic decisions.

Why This Role Matters

CFS is at an inflection point, moving from R&D to commercial execution. The deals, structures, and legal foundation this person builds now will directly shape how CFS contracts, partners, and scales for years to come. This is not a maintenance role - it is a builder role, for someone who wants outsized ownership over both the substance of high-stakes deals and the systems that make the whole commercial legal function work.

What You'll Do

Build & Scale the Commercial Legal Function Serve as the architect of CFS's commercial legal capability - building on and improving existing processes to create scalable contract workflows, tools, standard templates, negotiation playbooks, and training that empower business teams and accelerate deal velocity. Lay the groundwork for, and ultimately recruit and lead, a team as the function grows.

Lead High-Stakes Commercial and Partnership Negotiations Structure, draft, and negotiate complex, high-value commercial and partnership agreements, including key customer, supplier, and vendor deals, long-term procurement contracts, joint developments, strategic alliances, and partnerships.

Drive Corporate Development & Strategic Partnerships Serve as a core legal partner on corporate development initiatives - strategic partnerships, joint ventures, strategic investments, technology transfers, licensing, and other complex transactions central to scaling commercial fusion. Partner closely with corporate development and open innovation teams to structure and close deals that advance CFS's strategic position.

Support Core Corporate Legal Matters Provide legal support on corporate, subsidiary and entity management, and corporate transactions as they relate to commercial, corporate development, or strategic partnership transactions and agreements, serving as a trusted resource to the CLO, CFO, and CCO on corporate-adjacent legal needs beyond commercial deal work.

Advise Supply Chain & Operations Serve as the primary legal advisor to procurement and global supply chain teams, mitigating risk across complex, multi-tiered international supply chains for advanced hardware, specialized materials, and manufacturing.

Drive Pragmatic Risk Management Provide business-minded, creative, and actionable legal guidance that balances risk mitigation with the urgency and agility required to hit CFS's commercial milestones.

Cross-Functional Leadership & Collaboration Partner closely with commercial, corporate development, supply chain, engineering, global affairs, finance, and compliance teams to ensure alignment and seamless execution across all commercial and corporate development activity - and act as a visible legal leader within the broader organization.

What You'll Bring

Education & Bar: J.D. from an accredited law school and active bar admission in good standing in at least one U.S. jurisdiction (eligible for MA In-House Counsel registration).

Experience: 12+ years of legal experience, ideally starting at a top-tier law firm followed by significant in-house experience at a fast-growing, complex technology, energy, advanced manufacturing, or industrial company.

Commercial Expertise: Deep background in drafting and negotiating complex commercial contracts, strategic partnerships, global supply chain agreements, and corporate development transactions (JVs, strategic investments, licensing, tech transfer).

Corporate Legal Exposure: Familiarity with core corporate legal matters - governance, entity structuring, and general corporate transaction support - sufficient to advise confidently alongside commercial work.

0-to-1 Process Builder: Proven track record of creating, operationalizing, and/or improving commercial legal systems, contract management tools (CLM), and negotiation playbooks from the ground up.

Leadership Trajectory: Experience mentoring, managing, or building legal teams, or a clear readiness to do so - this role is expected to grow into a team lead position.

Business Acumen & Pragmatism: Exceptional judgment and the ability to synthesize complex technical, operational, and legal concepts into clear, actionable advice for non-lawyers.

Executive Presence: Comfort advising senior leadership and acting as a trusted strategic partner to the CLO and business unit executives.

Adaptability & Drive: A proactive, self-starter mentality comfortable operating in a fast-changing, high-ambiguity environment where innovation happens daily.

Mission Alignment: A genuine passion for clean energy, deep technology, science-based product commercialization, and CFS's mission to bring fusion to the grid.

Must-have requirements

  • Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics.
  • Willingness to occasionally travel or work required nights/weekends/on-call.

$250,000 - $300,000 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

Why Join CFS?

At CFS, you won't just be managing contracts - you will be laying the legal and commercial operational foundation for an entirely new global industry, with the opportunity to build and eventually lead the team that carries it forward. We offer competitive compensation, comprehensive health and wellness benefits, a collaborative environment, and the opportunity to work alongside world-class experts dedicated to solving one of humanity's greatest challenges.

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$250,000–300,000 /yr
Health insurance Dental insurance Vision insurance Retirement plan Paid time off Parental leave Learning budget

About this role

Posted
23 Sep 2026
Updated
23 Sep 2026
Job type
Full time
Workplace
On-site
Working hours
UTC-05:00
Experience
Senior

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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Assistant General Counsel - Commercial
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