Senior AP Specialist

About the role

Sr. Accounts Payable Specialist Opportunity in Torrance, California

Epirus operates at the intersection of technology and national defense, developing systems that address complex security challenges. The company's Leonidas product focuses on power management for high-demand defense systems. This page outlines the details for a Sr. Accounts Payable Specialist position based in Torrance, California. You will own the end-to-end execution of the accounts payable lifecycle, ensuring that every invoice, payment, and vendor record moves through strict procedural channels without error. Your work will directly uphold the integrity of financial data that supports high-stakes defense programs and enables mission-critical technology development. You will serve as the primary control point for vendor financial interactions, applying rigorous validation and compliance checks at every stage. This position demands a disciplined approach to documentation, timing, and approvals so that the organization can operate with confidence in its financial processes. By maintaining precise and transparent payable operations, you will contribute to the stability and reliability required in a technology-driven defense environment.

Key facts

What you'll do

• Execute the full accounts payable cycle with precision, managing invoice intake, three-way matching, and approval routing for defense-related transactions.
• Perform detailed scrutiny of invoices, verifying line items against contracts and purchase orders to ensure billing accuracy and regulatory compliance before entry.
• Design and maintain processing pathways that streamline vendor interactions, enabling efficient movement of documents into build workflows while preserving audit integrity.
• Coordinate the full vendor lifecycle, including credential collection, tax detail verification, and onboarding activities that facilitate smooth activation and ongoing management.
• Drive records toward completion by preparing payment packets, monitoring approval queues, and ensuring transactions are scheduled and executed on time.
• Partner with finance teams to reconcile discrepancies, align documentation, and sustain clear communication channels that support timely resolution of issues.
• Champion continuous improvement by refining filing structures, enhancing tracking mechanisms, and developing procedures that strengthen audit readiness and process reliability.
• Support system reliability and platform hygiene by monitoring exceptions, investigating variances, and upholding standards across all payable workflows and enterprise tools.

Requirements

• Must bring three to five years of accounts payable experience, with a preference for background in defense or regulated environments that require strict compliance.
• Demonstrate meticulous accuracy when managing sensitive financial data under tight timelines and high-volume invoice cycles.
• Capability to interpret contracts and purchase orders correctly to ensure proper billing execution and to prevent discrepancies in payment processing.
• Ability to navigate complex procedural standards while balancing multiple priorities and maintaining exact records in a regulated setting.
• Strong attention to detail required to manage the full payable cycle and uphold the integrity of financial controls.
• Capacity to work independently and collaboratively within cross-functional finance teams to resolve issues and align on documentation.
• Understanding of internal controls and compliance expectations essential for maintaining transparency and supporting audit objectives.
• Willingness to adhere to all company policies, procedural guidelines, and security standards that govern financial operations.

Nice to have

• Experience with the Leonidas platform or government defense billing structures, which can provide added context for specialized billing scenarios and compliance requirements.
• Familiarity with enterprise systems such as SAP, Coupa, Oracle, Microsoft Dynamics, Epic Systems, and Excel to support efficient data handling, reporting, and process automation.

Practical notes

This Sr. Accounts Payable Specialist position is part of Epirus efforts to strengthen financial controls and operational reliability in a technology-driven defense environment. The role contributes directly to the accuracy and efficiency of payable functions that support counter-unmanned aerial systems and counter-swarm operations. Applying through the designated channel ensures full consideration and access to updated instructions and procedural expectations. No additional practical notes regarding hours, travel, or visa requirements are specified in the source material.