Cost Accounting Manager

Commonwealth Fusion Systems

1050

Devens, MA, USA

Posted on: 2026-02-04

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 Cost Accounting Manager

The Cost Accounting Manager will be responsible for developing and leading management accounting initiatives for the company, with a focus on ensuring the costs of materials, magnet manufacturing sub-assemblies, and subsystems that make up SPARC, our fusion energy machine, are accounted for timely and accurately in our ERP.

#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.

What you'll do:

Develop and implement robust cost accounting policies, procedures, and controls to ensure accurate cost allocation, tracking, and reporting

Manage the inventory costing process, including the documentation and update of costing methods for materials, labor, and overheads

Coordinate with the FP&A and engineering teams to ensure the accuracy of Bills of Materials, capitalized inventory, and R&D expense

Coordinate with the logistics team to oversee the annual physical inventory count and inventory cycle counts; including assisting with root cause/corrective actions

Perform variance analysis of actual costs against expected costs in cooperation with financial analysts, investigating and explaining significant discrepancies

Lead audit preparation and preparation of deliverables, as it relates to inventory, work-in-process, construction-in-process, and certain fixed assets

Drive special projects to elevate the cost accounting function, such as ERP process enhancements and internal controls

Lead and develop a team of 1-2 accountants

Primary reviewer of account reconciliations and journal entries with accountability for related internal controls.

Prepare and analyze all grant accounting revenue and expenses driven on a reimbursement basis, ensuring all documentation is audit-ready

Drive improvements to processes and procedures

What we’re looking for:

Bachelor’s degree in Business Administration or Accounting or similar field preferred

Minimum of 7 years experience in Accounting, including a minimum of 5 years in supervisory role

Experience with ERP Systems

Proven experience as a cost accountant, cost analyst, or similar role, with a focus on data analysis and strong knowledge of cost accounting principles and practices

Experience using a large ERP system

Bonus points for:

Experience in an organization funded by government grants or contracts

Must-have Requirements:

Perform extended activities such as stooping, climbing, typing, standing, sitting, etc.

Willingness to travel or work required nights/weekends/on-call occasionally

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

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