Senior Cost Accountant

Commonwealth Fusion Systems

1050

Devens, MA, United States

Posted on: 2025-11-20

Category: renewables

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Employment type:

Full time

Experience required:

Senior

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 a Senior Cost Accountant

The Senior Cost Accountant will support key Accounting and Inventory controls across the organization while being a contributing member of the team handling standard cost management, variance analysis, and inventory valuations. This team member will work closely across multiple departments at CFS and must be a goal oriented team player who displays a strong intuition on how to tackle novel costing challenges.

#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:

Standard Cost Management:

Develop, maintain, and update standard costs for raw materials, labor, and overhead

Monitor and analyze cost variances, including material, labor, and overhead variances

Review and adjust standard costs to reflect changes in manufacturing processes and market conditions

Ensure we accurately capture and apply costs to projects across the company

Cost Analysis & Reporting:

Analyze manufacturing costs and prepare detailed reports on cost performance

Identify trends and variances in production costs and recommend corrective actions

Provide detailed cost analysis and insights to support decision-making for pricing, budgeting, and forecasting

Provide cost-related data and analysis to support financial planning

Variance Analysis:

Conduct variance analysis on actual vs. standard costs, explaining reasons for differences

Work with production and operations teams to understand and mitigate cost variances

Prepare regular reports on cost variance, highlighting areas of concern and opportunities for cost reduction

Prepare journal entries to allocate cost variances

Inventory Management:

Assist in monitoring and valuing inventory, ensuring accuracy in cost allocation

Conduct periodic inventory reconciliations and analyze inventory variances

Support physical inventory counts and investigate discrepancies between physical counts and system records

Continuous Improvement:

Collaborate with cross-functional teams to assess processes, their inputs, outputs, quality and other factors, in order identify and implement improvements to process quality, accuracy and cost

Support the development and implementation of process improvements related to cost accounting and reporting, as well as other accounting processes, including purchase order accuracy and completeness, credit memo application, parent-child effectiveness, etc.

What we’re looking for:

Bachelor’s degree in accounting, finance or business administration preferred

7+ years' experience as a cost accountant, cost analyst, or similar role, with a focus on data analysis and knowledge of cost accounting principles and practices

Experience with inventory in a manufacturing environment

Ability to keep organized and demonstrate flexibility in a fast-paced environment

Excellent analytical skills and strong attention to detail

Strong Excel Skills

Bonus points for:

2+ years audit experience with Big 4 or similar

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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