Accounts Payable Specialist

Commonwealth Fusion Systems LLC; Massachusetts; Hybrid; USD 55,000 - 83,000; Full time

Benefits offered by this job

13 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

Job summary

Commonwealth Fusion Systems LLC in Massachusetts is seeking an Accounts Payable Specialist to manage high-volume AP processing with accuracy and timeliness. You will handle invoice processing, matching, and month-end support, reporting to the AP Supervisor, and work with internal partners to resolve discrepancies.

The role requires ERP experience, strong Excel skills, attention to detail, and excellent communication.

Qualifications

• High-volume AP experience with two-way and three-way matching.
• Vendor communications and month-end support.
• ERP experience required.
• Strong Excel, detail-oriented, organized, and communicative.
• Ability to investigate discrepancies and follow processes.

Responsibilities

• Manage roughly 200–300 invoices per week with verification and coding.
• Perform two-way and three-way matching and resolve discrepancies.
• Resolve exceptions with Procurement, Receiving, and vendors.
• Support month-end close and accruals.
• Identify process improvements and update procedures.
• Own follow-through with due dates and vendor communications.

Skills

High-volume AP

Two-way matching

Three-way matching

Vendor communication

Month-end close support

Discrepancy investigation

Excel proficiency

Process improvement

Tools

ERP systems

Job description

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, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading 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 Accounts Payable Specialist

As an Accounts Payable Specialist, you will be responsible for providing accurate, timely accounts payable processing while helping improve how invoices move from receipt to payment. Reporting to the Accounts Payable Supervisor, the AP Specialist will manage a high-volume invoice queue, investigate discrepancies, coordinate resolution with vendors and internal partners, and support month-end close. The role calls for curiosity about why problems occur and practical ideas that reduce repeat issues, delays, and rework. The AP Supervisor remains accountable for team priorities, oversight, and escalation decisions. The AP Specialist owns assigned invoice processing, documentation, and follow-through; coordinates with the responsible buyer, requester, or approver; and escalates unresolved issues with facts and a proposed next step. Payment approvals, purchasing decisions, and accounting policy remain with authorized owners.

What you’ll do:

• Invoice processing: Manage roughly 200–300 invoices per week; verify vendor, invoice number, date, amount, entity, PO, and coding using approved guidance; investigate duplicate alerts before processing
• Matching and controls: Perform two-way and three-way matching; verify receipts, service approvals, payment terms, tax, freight, and exemption support; resolve or elevate discrepancies before payment
• Exception resolution: Work with Procurement, Receiving, requesters, and vendors to resolve missing receipts, insufficient PO funds, billing errors, and approval delays; track hold reasons, owners, and next action dates
• Vendor and payment support: Respond professionally to payment inquiries; obtain corrected invoices and credit memos; track credits and refunds; prepare payment support under established approvals and safeguards, including duplicate-payment checks for automatic debits
• Month-end support: Identify unbilled vendor and contractor costs; provide accrual support and reconcile vendor statements and AP records; coordinate coding questions and close items with Accounting
• Process improvement: Identify recurring exceptions and their causes; recommend practical fixes; update procedures and support approved workflow improvements, system testing, and cross-training
• Own the follow-through: Organize the queue by due date and risk, follow up promptly, and close the loop with vendors and internal partners
• Ask and investigate: Question unclear or inconsistent information, use supporting records to understand the issue, and bring recommendations to the supervisor
• Collaborate and protect controls: Work constructively across functions, communicate blockers early, handle sensitive information carefully, and preserve required approvals and documentation

What we’re looking for:

• Relevant high-volume accounts payable experience, including two-way and three-way matching, vendor communication, and month-end support
• ERP experience required
• Working knowledge of debits and credits, accruals, expense coding, purchase orders, GL accounts, and reconciliations
• Strong Excel, strong attention to detail, atrong organization, and clear communication
• Ability to investigate discrepancies, recognize patterns, follow through, and adapt as processes change

Must-have requirements:

• Perform activities such as typing, standing, or sitting for extended periods of time
• 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

$40 - $60 an hour

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
• 13 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-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.