Executive Assistant

Commonwealth Fusion Systems

1050

Devens, MA, USA

Posted on: 2026-02-05

Category: renewables

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Employment type:

Full time

Experience required:

Intermediate

Salary

Salary not provided

About the company:

Commonwealth Fusion Systems (CFS) is on a mission to deliver clean fusion energy to the planet fast enough to matter for humanity’s biggest challenges.

It’s urgent. The gap between the energy we need and the energy we have is widening every day. Fusion is a critical part of the energy transition away from fossil fuels, a new chapter for the world’s energy supply.

We’re committing to delivering fusion power plants and a full-fledged fusion energy industry as we’ve delivered on other promises. Like the world’s strongest high-temperature superconducting magnet, the game-changing technology that’s making commercial fusion energy a reality.

We’ve raised over $2 billion in capital — more than any other fusion energy company — and attracted top talent to design, build, and deliver commercial fusion power plants. And we’re working with policymakers and suppliers to make fusion energy available globally.

As we push toward the fusion-energy future, we’ll keep setting and meeting milestones, sharing and validating our progress, and encouraging others to do the same.

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 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 an Executive Assistant

We’re looking for an experienced Executive Assistant to join our high-performing People Operations team. This role supports multiple C-Suite executives and works alongside four other EAs who collectively ensure the executive team is well-coordinated, informed, and focused on what matters most.

The ideal candidate thrives in a fast-moving, high-growth environment and knows how to bring structure, organization, and calm to the chaos that often comes with start-up life. You’re the type who anticipates needs before they’re spoken, stays two steps ahead, and takes pride in being known for your reliability, judgment, and professionalism.

#LI-Hybrid

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.

What you'll do:

Provide proactive administrative support to multiple C-Suite executives, including complex calendar management, travel coordination, expense reporting, and document preparation

Serve as a trusted partner and representative for executives, ensuring timely communication and follow-through on priorities

Manage competing priorities and maintain confidentiality with the highest level of discretion

Coordinate and host on-site meetings and visits, including managing catering orders, greeting guests, and ensuring meeting spaces are properly set up and equipped

Partner closely with the broader EA team to ensure seamless communication, scheduling alignment, and support coverage across the executive suite

Anticipate logistical and operational needs, identify gaps, propose solutions, and execute without being asked twice

Support cross-functional coordination between executives and their teams, acting as a connector and communicator when needed

Adapt to shifting priorities and feedback while maintaining a positive, composed, and professional approach

What we’re looking for:

7+ years of experience as an Executive Assistant, with direct support to multiple executives at the C-suite or senior leadership level

Proven success in fast-paced, startup or high-growth environments, with the ability to stay organized and calm under pressure

Strong attention to detail and commitment to delivering high-quality work consistently

Exceptional written and verbal communication skills

Demonstrated ability to work independently while also thriving as part of a team

High emotional intelligence (EQ) - able to read a room, build trust quickly, and navigate sensitive situations with professionalism and empathy

A reputation for reliability, discretion, and sound judgment, someone leaders can depend on without hesitation

Tech-savvy with strong proficiency in tools such as Google Workspace, Slack, Zoom and Teams

Must-have Requirements:

Perform activities such as stooping, climbing, typing, standing, or 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

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