Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by the United States and its allies to address their most significant and complex challenges in science, security and sustainability. Our people apply undaunted curiosity, relentless ambition and boundless imagination to challenge convention and drive progress. Our commitments are underpinned by the belief that safety, collaboration and well-being are integral to success. Headquartered in Chantilly, Virginia, we have approximately 50,000 employees in more than 70 countries across all 7 continents.

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.

Position Title: Executive Assistant & Office Lead (Canberra & Sydney)
Location: Sydney (with responsibility for Sydney and Canberra office operations)
Employment Type: Part‑time (60% LOE)

Role Purpose

The Executive Assistant & Office Lead provides high‑level executive support to the Managing Director and Leadership Team while ensuring the effective day‑to‑day operation, governance, and presentation of the Canberra and Sydney offices.

This role is trusted, highly autonomous, and pivotal to enabling leadership effectiveness, maintaining operational discipline, and presenting a professional, well‑run office environment aligned to corporate, security, and client expectations.

Key Accountabilities 1. Executive & Leadership Support

• Provide proactive, confidential executive assistance to the Managing Director, including complex diary management, email prioritisation, travel coordination, and preparation of briefings and papers.
• Support the broader Leadership Team with meeting coordination, agenda preparation, action tracking, and follow‑up.
• Act as an effective gatekeeper, managing competing priorities, anticipating issues, and ensuring time is focused on high‑value activities.
• Prepare correspondence, reports, presentations, and executive submissions with a high standard of accuracy and judgement.
• Coordinate leadership meetings, offsite/site visits, and key internal events, including logistics and materials.
• Manages Travel bookings and expense claims for leadership team and conduct monthly reconciliations of Credit Cards

2. Office Lead – Canberra & Sydney

• Act as the primary point of accountability for the effective operation and presentation of the Canberra and Sydney offices.
• Coordinate office services including facilities, access cards, security, meeting rooms, and visitor management.
• Liaise with Amentum Real Estate team, landlords, property managers, and service providers to ensure issues are promptly resolved.
• Maintain office readiness for leadership visits, customer engagements, audits, and external stakeholders.
• Oversee general office supplies, contracts, and basic budget tracking related to office operations.

3. Governance, Compliance & Security Support

• Support compliance with corporate, Defence, and government security requirements (e.g. visitor protocols, document handling, secure meetings).
• Maintain controlled records, registers, and leadership documentation in accordance with internal management system requirements.
• Support audits, reviews, and inspections by ensuring documentation, scheduling, and office arrangements are in order.
• Handle sensitive and classified information with discretion, professionalism, and sound judgement (subject to clearance requirements).

4. Stakeholder & Communication Management

• Act as a key interface between the Managing Director, Leadership Team, staff, and external stakeholders.
• Draft and coordinate internal communications on behalf of leadership where appropriate.
• Build strong relationships across the business to facilitate smooth information flow and issue resolution.

5. Continuous Improvement & General Administration

• Identify and implement improvements to executive support processes, office operations, and ways of working.
• Provide ad‑hoc administrative, coordination, and project support as required by leadership.
• Support corporate initiatives, change activities, and growth phases where executive coordination is critical.

Key Skills & Experience Essential

• Demonstrated experience as an Executive Assistant supporting senior executives or leadership teams.
• Strong judgement, discretion, and ability to handle highly sensitive and confidential information.
• Excellent organisational skills with the ability to manage competing priorities in a fast‑paced environment.
• High proficiency in Microsoft Office (Outlook, Word, Excel, PowerPoint, Teams).
• Professional communication skills, both written and verbal.
• Proven ability to work autonomously while maintaining strong alignment with leadership intent.

Desirable

• Experience in a Defence, government, engineering, or regulated professional services environment.
• Experience acting as an office or facilities lead across multiple sites.
• Familiarity with security‑aware environments and compliance‑driven organisations.
• Ability to obtain and maintain an Australian Government security clearance (or willingness to do so).

Personal Attributes

• Highly trusted, discreet, and professional.
• Confident dealing with senior leaders and external stakeholders.
• Proactive, solutions‑focused, and resilient under pressure.
• Strong attention to detail with the ability to see the broader organisational context.
• Approachable and service‑oriented while maintaining appropriate boundaries.

Working Relationships

• Managing Director
• Leadership Team
• Employees across Canberra and Sydney offices
• Corporate services (IT, HR, Finance, Security, UK Real Estate Team)
• Property managers, suppliers, and external stakeholders

Performance Measures

• Effectiveness and reliability of executive support
• Smooth operation and presentation of Canberra and Sydney offices
• Quality, accuracy, and timeliness of leadership support outputs
• Stakeholder satisfaction and responsiveness
• Compliance with governance and security expectations

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.