Corporate Controller
Commonwealth Fusion Systems
Accounting & Finance
Devens, MA, USA
Posted on Nov 5, 2025
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 a Corporate Controller
We are actively seeking a dynamic finance leader to join our team as Corporate Controller. This role is responsible for managing and overseeing the financial operations of our Company and includes ensuring accurate financial reporting, designing and maintaining internal controls, and leading accounting operations.
The Company is on a successful and well-funded journey from a pre-revenue stage to an operating company with a broad range of commercial and development activities. We look to the Corporate Controller to bring a wide range of financial, process control and business insight.
The successful candidate will be a critical member of the Company’s leadership team, reporting to the Chief Financial Officer. A strong accounting background, including a CPA certification and experience as the corporate functional leader of a dynamic, growing company is critical. As the Company continues on its journey, the successful candidate will have experience implementing and complying with the Sarbanes-Oxley (SOX) Act and is comfortable with the rigid reporting requirements of an SEC-registrant.
What you'll do:
- Financial Management and Reporting: Consolidate and prepare accurate financial statements, ensuring compliance with applicable accounting standards, regulatory requirements, and internal policies; oversee month-end, quarter-end and year-end closing processes. Compliance will include overseeing the annual financial statement audit, 401(k) audit, 409(a) valuations, and tax reporting.
- Cost Accounting: Oversee the cost accounting team, developing cost accounting policies and procedures, and ensuring consistency in cost accounting practices. In addition, implementing cost control measures, and working with other departments to optimize resource allocation.
- Internal management reporting: Support all internal management reporting and analysis, with other finance team members and act as a strategic finance advisor to the business.
- Investor interactions and reporting: Support investor diligence, reporting needs, audit confirmations, tax forms (K1s) and more detailed reporting as needed.
- Controls environment: Grow and strengthen the system of internal controls to prepare the Company to be compliant with the Sarbanes-Oxley Act, and well-prepared for a potential SEC-registrant in the future.
- Accounting operations: Manage and grow key related financial functions, including accounts payable, payroll and cash management, and build a commercial-ready accounts receivable department. Experience with process improvements and finance transformation in this area is highly desirable.
- Company leadership team: As a member of the company’s leadership team, provide insight on process improvement, business planning and financial optimization, including inventory management, general (risk-related) insurance, ERP, compliance and other issues as they arise.
- Audit Committee: In collaboration with the CFO, lead interactions and reporting to the Audit Committee.
- Technical accounting advisor: Inform the business on technical accounting considerations as the Company expands and commercializes its technology.
- Team management and development: Serve as a coach and mentor to employees and build an exceptional team, including managing the team in accomplishing work in each area of responsibility, setting objectives, overseeing work, providing feedback and working with team members on career development plans.
What we’re looking for:
- Bachelor’s (or advanced) degree in Accountancy
- Minimum of 10 years of progressive accounting experience, including at a publicly-traded company with experience building and leading an accounting operations team, executing timely financial reporting and month-end close; managing a payroll department a plus
- Experience preparing and taking a company through growth stages is a plus
- CPA license (active status preferred)
- Prior experience as a controller having led and motivated a team, delegated tasks, and managed performance
- Strong working knowledge of U.S. GAAP and demonstrated experience implementing accounting policies in a variety of finance and accounting areas, including experience with ASC606 evaluation and adoption
- Experience with multi-currency, location and segment consolidations and reporting
- Demonstrated experience in design and implementation of accounting policies, processes, and systems in a rapid growth environment
- Experience coordinating annual tax preparation and filing; experience with partnership / passthrough tax filing a plus
- Active interest in, and commitment to, the Company’s mission to address climate change
- Understanding of, experience with, and commitment to delivering required results safely
- Experience managing a highly motivated team and working in a dynamic, entrepreneurial environment
- Detailed, well organized, deadline oriented, and comfortable with soliciting information from a variety of sources
- Strong communications skills, both written and oral, to capture needed inputs and share results and findings in a manner which is accurate, timely and effective
Must-have Requirements:
- Willingness to travel or work required nights/weekends/on-call occasionally
- Local/onsite in Devens, Massachusetts required
- 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
#LI-Onsite
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.