Senior Accountant

Commonwealth Fusion Systems
Devens, MA

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 over $2 billion in capital – more than any other fusion energy company in the U.S.

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 Accountant

As our Senior Accountant, you will report directly to the Head of Accounting to enable an accurate, timely, and efficient financial close process at CFS. We are a startup company that is moving rapidly to build a one-of-a-kind prototype fusion energy device, and this requires an outstanding accounting process to tell the financial story behind achieving fusion power to our investors and other stakeholders. We’re looking for someone who can serve a key role in the execution of our monthly close process and annual audit, while also assisting with special projects for GAAP compliance, ERP optimization, and building a robust internal control environment at CFS.

The company is growing rapidly and this position offers a great way to join the company, add value immediately and have significant growth potential.

What you'll do:

  • Execute monthly financial close process, including preparation of journal entries, subledger reviews, and general ledger reconciliations strictly adhering to the close deadlines
  • Prepare financial statement footnotes and supporting documents for audited financial statements
  • Coordinate and assist with year end audit requests
  • Assist with research for complex accounting matters and interpretation of technical accounting guidance
  • Participate in the optimization of our ERP (Odoo) and enhancement of related internal controls and process documentation
  • Develop and document businesses and accounting policies to maintain and strengthen internal controls
  • Work collaboratively with Head of Compliance to document internal controls and update periodically
  • Perform monthly variance analysis for the changes in the Balance Sheet and P&L
  • Review and approve journal entries and account reconciliations prepared by Staff Accountant/s making sure they are supported by detailed and accurate electronic records
  • Collaborate with FP&A team on annual budget, monthly/quarterly re-forecast and budget to actual analysis.
  • Prepare ad hoc reports for management – including various department requests

What we’re looking for:

  • Bachelor’s degree in Business Administration or Economics preferred
  • Minimum 4 years Accounting or Audit experience
  • Strong knowledge of and exposure to US GAAP
  • Strong attention to detail
  • Proficiency with Microsoft Office, particularly Microsoft Excel
  • Ability to keep organized and demonstrate flexibility in a fast-paced, startup company environment
  • Ability to work and manage time independently, as part of a collaborative team
  • A strong communicator (particularly written communication), with a service-oriented mindset

Bonus points for:

  • Experience with Odoo ERP system
  • Experience in Fixed Assets accounting
  • CPA preferred
  • Big 4 Audit, Advisory, or Tax Experience

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

$110,000 - $185,000 a year

Salary range for this full-time position + equity + benefits . The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations. Benefits include:

Competitive compensation with equity

12.5 Company-wide Holidays

Flexible vacation days

10 sick days

Generous parental leave policy

Health, dental, and vision insurance

401(k) with employer matching

Professional growth opportunities

Team-building activities

#LI-Remote

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.

Posted 2025-09-06

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