Senior Accounts Payable Specialist

The Role:

Agenus is at an exciting stage of growth and transformation as we advance our innovative oncology programs and work to bring the next generation of cancer therapies to patients. As the organization continues to evolve, we are looking for a highly motivated and experienced Senior Accounts Payable Specialist to join our Finance team and play an important role in supporting the business.

This is a hands-on role for someone who takes pride in accuracy, ownership, and getting things done. You will support the full accounts payable cycle while partnering closely with Finance, Purchasing, internal teams, and external vendors. We are looking for someone who is naturally proactive—someone who doesn't just follow a process, but asks questions, solves problems, and looks for ways to make things work better and more efficiently.

You'll be joining a fast-paced, collaborative environment where priorities move quickly and the work of our Finance team directly supports the broader mission of advancing innovative medicines for patients. The role also provides opportunities to broaden your experience by partnering with other members of Finance on projects and initiatives beyond day-to-day accounts payable responsibilities.

This role is required to be onsite in Lexington, MA 5 days a week.

In the role you will:

· Reviews invoices for accuracy; obtain approvals and match with purchase orders to verify receipt of goods and input vendor invoice data and documents into the ERP System

· Manages the AP Mailbox and communicates directly with operations staff and vendors to resolve disputes or concerns relating to accounts payable

· Processes weekly AP check run in compliance with company policies and within payment terms

· Prepares checks and wires for weekly disbursement and mailing

· Reviews, assigns proper general ledger account code, and processes non-purchase order invoices, expense reports, and manual check requests.

· Work with the Purchasing Department to resolve purchase order discrepancies, incorrect quantities/items received, price variances, discounts, payment terms, etc. as efficiently as possible

· Reconcile vendor statements and proactively research and resolve outstanding invoices, credits, duplicate payments, and other discrepancies.

· Review AP aging and outstanding items and partner with internal stakeholders and vendors to drive timely resolution.

· Reconcile accounts payable records and applicable general ledger accounts and assist with the AP month-end close process.

· Enters Form W-9 information into vendor maintenance as needed and processes annual 1099 forms.

· Maintain accurate supporting documentation and ensure AP activities are performed in accordance with company policies, internal controls, and established procedures.

· Support internal and external audit requests related to accounts payable by providing documentation and responding to inquiries as needed.

· Build strong working relationships with internal business partners and proactively follow up on outstanding approvals, documentation, and other items needed to keep payments moving.

· Identify opportunities to streamline, automate, and improve accounts payable processes, controls, and overall efficiency.

· Serve as a knowledgeable resource for employees and vendors on accounts payable processes, payment status, and related questions. Performs other special projects/duties as assigned.

Qualifications: About You

· 5+ years of relevant Accounts Payable experience.

· Bachelor’s degree with an Accounting focus preferred.

· Strong understanding of accounts payable processes, basic accounting principles, and internal controls.

· Experience managing a high volume of invoices and competing deadlines in a fast-paced environment.

· Proficiency with accounting software; experience with Oracle Fusion a plus.

· Must be proficient in Microsoft Office Suite, with an emphasis on Excel.

· Strong Excel skills and comfort working with large sets of financial data.

· Demonstrated ability to solve problems, maintain confidentiality, and exercise sound judgment.

· Proactive and resourceful, with the ability to independently research issues, identify solutions, and drive items through resolution.

· Strong sense of ownership and accountability with the ability to manage priorities with limited oversight.

· Ability to work well with others in a fast-paced, dynamic environment with tight deadlines.

· Exceptional organizational skills with strong attention to detail and accuracy.

· Ability to communicate effectively and professionally with vendors and employees across all levels of the organization.

· Effective team member who displays initiative.

· Excellent written and verbal communication skills.

The targeted salary range for this position is $60,000 - $89,000 per year. Agenus is making a good faith effort to be transparent and accurate around our hiring ranges. The salary offered is commensurate with Agenus’s compensation philosophy and considers factors including, but not limited to, education, training, experience, external market conditions, critical needs of the role, and internal equity.

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