Amentum is a leader in global engineering, project management and solutions integration, trusted to modernise the most critical missions anywhere in the world. Driven to create a safer, smarter, cleaner world, we innovate as a team of inventive doers passionate about making a difference. Underpinned by a strong culture of ethics, safety and inclusivity. Amentum is fiercely committed to operational excellence and successful execution.

Are you seeking a career that offers a healthy work-life balance, a friendly company culture, and engagement with a supportive community?

We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive and diverse team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

Amentum is proud to be an Equal Opportunity Employer, please refer to our Enterprise Agreement and www.fairwork.gov.au for more information.

Role Description:

The Air Combat Systems Program Office (ACSPO) manages the acquisition and sustainment of Australia’s F‑35A Lightning II capability. It provides Asset, Project, Financial, Engineering, and Business Management Support for F‑35 sustainment and associated AIR06000 project phases.

As a key member of the Finance team, you will play an important role in ensuring the accuracy, compliance, and efficiency of the Accounts Payable function. Working under limited direction, you’ll be responsible for processing high‑volume international invoices, maintaining financial data integrity, and acting as a primary point of contact for accounts payable enquiries.

This role suits someone who enjoys structured financial processes, detailed transactional work, and adding value by translating data into meaningful insights that support informed business decisions.

• Processing high volumes of international supplier invoices with accuracy and correct coding
• Verifying funds availability and escalating discrepancies where required
• Preparing and posting journal entries for month‑end and financial adjustments
• Supporting cash flow accuracy through timely invoice processing and payment controls
• Maintaining compliance and audit‑ready financial documentation
• Collaborating with internal teams and suppliers to resolve invoice issues and improve processes
• Responding professionally to internal and external Accounts Payable queries
• Supporting internal controls through early identification of risks, trends, or anomalies in financial data

You take pride in precision, accuracy, and maintaining the financial integrity of business operations. You enjoy working with large data sets, identifying issues before they become problems, and contributing to a smooth end‑to‑end Accounts Payable process.

You’re comfortable working both independently and as part of an integrated team, with the confidence to engage stakeholders at all levels. You can clearly explain financial information, provide practical insights, and help others understand what the numbers mean.

Essential Requirements:

• Bachelor’s degree in finance, Accounting, or Commerce / Alternatively, a Diploma/Advanced Diploma in Accounting
• Experience in Accounts Payable or Transactional Finance, including end‑to‑end invoice processing, approvals, and payments
• Strong understanding of financial data, with the ability to interpret results and translate numbers into insights for stakeholders
• Advanced Excel capability, including pivot tables, VLOOKUP/XLOOKUP, SUMIFS, IF statements, and data cleansing/manipulation
• Ability to analyse large data-sets, identify trends or anomalies, and maintain data integrity
• Familiarity with cash flow management, balance sheet reconciliations, and financial statements (P&L and cash flow)
• Basic compliance and audit awareness
• Exposure to ERP systems and reporting tools such as SAP and Power BI (desirable)
• High attention to detail with strong data‑entry accuracy
• Ability to manage high‑volume workloads accurately and meet deadlines
• Confident communication skills with the ability to engage internal and external stakeholders
• A process‑driven, organised approach with a commitment to continuous improvement

Required Security Clearance Level: NV1
Location: RAAF Base Williamtown - Near Newcastle Airport
Weekly Hours: Onsite - 40 Hours (Monday-Friday)

Compensation Details:

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance

• Paid time off and holidays

• Retirement benefits (including 401(k) matching)

• Educational reimbursement

• Parental leave

• Employee stock purchase plan

• Tax-saving options

• Disability and life insurance

• Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting:

Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.