Senior Accounts Payable Specialist

Agenus; Lexington (MA); On-site; USD 60,000 - 89,000; Full time

Benefits offered by this job

Medical, Dental & Vision Coverage

401(k) Match

Employee Stock Purchase Plan

Flexible Vacation Plan

Education Assistance Program

Employee Assistance Program

Job summary

Agenus is seeking a highly motivated Senior Accounts Payable Specialist to join our Finance team in Lexington, MA. This hands-on role supports the full AP cycle, collaborating with Finance, Purchasing, internal teams, and vendors to ensure accurate, timely payments.

You will contribute to process improvements, maintain strong internal controls, and help drive efficient AP operations in a fast-paced environment focused on advancing innovative medicines for patients.

Qualifications

• 5+ years of relevant Accounts Payable experience.
• Bachelor’s degree with an Accounting focus preferred.
• Strong understanding of accounts payable processes and internal controls.
• Experience with Oracle Fusion a plus.
• Proficient in Microsoft Office Suite, with Excel emphasis.
• Strong Excel skills and ability to work with large financial datasets.
• Demonstrated problem-solving, confidentiality and sound judgment.

Responsibilities

• Reviews invoices for accuracy; matches with purchase orders and inputs data into the ERP system.
• Manages the AP mailbox and communicates with operations staff and vendors to resolve issues.
• Processes weekly AP check runs in line with policies and payment terms.
• Prepares checks and wires for weekly disbursement.
• Reconciles vendor statements and addresses discrepancies.
• Assists with AP month-end close and GL associations.
• Supports internal and external audits with required documentation.

Skills

Accounts Payable

Excel

Vendor communications

Office Suite

Analytical skills

Education

Bachelor's degree (Accounting focus)

Tools

Oracle Fusion

Job description

We are a dedicated group of scientists, physicians, and businesspeople working together toward one goal: to discover and develop therapies that can unleash the power of the body’s immune system to treat and potentially cure cancer. We are passionate about the work we do every day at Agenus to deliver on the promise of immuno-oncology. If you’re looking for an inspired environment, passionate colleagues, and a culture that nurtures learning, innovation and team success, we invite you to join us.

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.

Learn More About Agenus

Explore our innovative pipeline and connect with us on LinkedIn.

Why You’ll Love Working at Agenus

Benefits

We’re proud to offer a comprehensive and inclusive benefits program designed to support your well-being, growth, and life outside of work:

• Medical, Dental & Vision Coverage – Competitive options for both US & UK employees
• Flexible Spending Accounts – For healthcare and dependent care expenses (US)
• Flexible Vacation Plan – We believe time away leads to better thinking and innovation.
• Care.com Memberships – Support for family care (US)
• Education Assistance Program – Invest in your learning and development (US)
• 401(k) Match
• Employee Stock Purchase Plan
• Employee Assistance Program (EAP) – Resources for mental health, well‑being, and life support
• Reward & Recognition Program – Celebrate contributions that move the mission forward

What We Believe

• Patients First. We’re here to make a difference—for every cancer patient.
• Bold & United. Big goals require strong teams.
• Integrity Always. Respect and honesty guide everything we do.
• Own It. We take responsibility—for results and how we achieve them.
• Always Learning. Curiosity drives innovation.
• Bring Your Best. Every day matters.