The Role
The Executive Assistant will support multiple C-Suite executives, manage calendars, coordinate travel, prepare documents, and facilitate communication among teams.
Summary Generated by Built In
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 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.
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
#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.
Top Skills
Google Workspace
Slack
Teams
Zoom
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The Company
What We Do
Commonwealth Fusion Systems (CFS) has the fastest, lowest cost path to commercial fusion energy.
CFS is collaborating with MIT to leverage decades of research combined with new groundbreaking high-temperature superconducting (HTS) magnet technology. HTS magnets will enable compact fusion power plants that can be constructed faster and at lower cost. CFS is now building SPARC, the world's first commercially relevant, net energy fusion demonstration device. SPARC will pave the way for the first fusion power plant, ARC, that will produce power on the grid.
The ultimate mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. CFS has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by the world’s leading investors, CFS is uniquely positioned to deliver limitless, clean, fusion power to combat climate change.
If you are interested in joining our team, check out cfs.energy/careers for more information.
