Assistant Project Manager | Asystent/Asystentka Kierownika Projektu

Join Our New Integrated Delivery Solutions team in Warsaw!

At Amentum, we're not just solving problems — we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values diversity and ethical excellence, this is the place where your ambition can thrive.

We believe success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all. If you're ready to join a team that values your unique perspective and is committed to your safety, well-being, and professional growth — we’d love to hear from you.

The selected candidate will be employed by Critical Mission Services Sp. z o.o., part of Amentum.

About the opportunity

Amentum is the Technical Advisor to PEJ Sp z o.o. (PEJ), which is the state-owned entity responsible for delivering Poland’s first nuclear power programme. The Technical Advisor’s (TA) role is that of an “Owner’s Engineer”, which is not involved directly in any NPP design or construction activity, but rather acts as an advocate for the Client, applying technical due diligence to all aspects of the process, along with supply chain and contract management support for plant and equipment vendors engaged by the Client. The TA fulfils this function through the delivery of engineering and technical packages of work (referred to as Service Authorisations, SA’s) which require the development, approval, implementation and reporting of a diverse range of engineering and technical methods by suitably qualified and experienced team members.
The role of Assistance Project Manager is to support the Project Manager with the management of assigned multidiscipline projects within the engineering and technical programme of work through all phases, from inception to completion. The Assistant Project Manager collaborates with other project functions and may need to support certain administration tasks as necessary. We are happy to consider candidates available to work out of our Warsaw office.

You will be required to work from the office 3 days per week.

The Assistant Project Manager is responsible for:

• Supporting the delivery of multidisciplinary projects throughout the full project lifecycle, from initiation and planning through execution, monitoring, control and close-out.

• Assisting with the preparation of scopes of work, schedules, estimates, service authorisations and project proposals.

• Supporting project delivery activities including estimating, procurement, project controls, change management, risk management and governance processes.

• Coordinating inputs from technical teams, planners and stakeholders to support project planning, monitoring, reporting and decision-making.

• Preparing, reviewing and challenging project information and contributing to routine project reports, change notices and governance reviews.

• Monitoring project budgets and expenditures, reviewing supply chain invoices and supporting financial reporting activities.

• Assisting with supply chain and procurement processes, including purchase orders and supplier documentation.

• Supporting quality management activities, including quality documentation, document reviews, approvals and audit preparation.

• Maintaining project documentation and document control systems, including SharePoint, Technical Execution Plans (TEPs) and other project deliverables.

• Coordinating travel-related documentation and supporting project controls reporting, including flights and per diem records.

• Organising internal and external meetings, preparing meeting minutes and facilitating effective communication across project teams and stakeholders.

• Acting as CV coordinator and supporting resource and proposal activities as required.

• Providing project management guidance and support to team members and deputising for the Project Manager during short periods of absence.

• Supporting compliance with Business Management System (BMS) requirements, project governance standards and safe project delivery practices

Requirements:

• Bachelor’s degree (or equivalent qualification) in Engineering, Business, Project Management or a related discipline.

• Minimum 4 years of professional experience in an engineering or technical environment.

• Experience supporting projects and working within multidisciplinary teams is an advantage.

• Proficient in Microsoft Office applications, including Excel, Word, PowerPoint and Outlook.

• Strong interpersonal and communication skills, with the ability to build effective working relationships with stakeholders at all levels.

• Ability to work collaboratively within project teams and in a fast-paced, multidisciplinary environment.

• Strong organisational skills with the ability to manage priorities and meet deadlines.

• Proactive, detail-oriented and capable of working independently when required.

• Willingness and ability to obtain BPSS security clearance (or equivalent), if required for project delivery.

We offer

• International working environment and unique company culture fostering individual career growth and work-life balance

• Personal development opportunities and training in industry-leading tools

• Friendly and supportive team atmosphere

• Participation in global projects and process improvements

• Full-time employment contract with competitive salary

• Benefits package including medical care, life insurance, My Benefit cafeteria with co-financing for sports activities, employee wellbeing support program

• Flexible working hours (start between 8:00–9:30)

• Short Fridays (Monday to Thursday we work 8,5h. Friday is a 6-hour workday)

• Modern office in an attractive location

Our Commitment to Inclusion

We know that if we are inclusive, we’re more connected — and if we are diverse, we’re more creative. We welcome people for who they are, regardless of age, disability, gender identity or expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, or family status.

Compensation Details:

Compensation Information regarding the salary for this position will be shared at later stages of the recruitment process, in a way that ensures transparent and well-informed negotiations.

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:

09/28/2026 - Until Filled

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.

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About Us

For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients. Our headquarters are in Chantilly, VA. Find us online at https://www.amentum.com/

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