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, inclusion and well-being are integral to success. Headquartered in Chantilly, Virginia, we have more than 53,000 employees in approximately 80 countries across all 7 continents.

In Poland, Amentum offices are located in Warsaw and Kraków. The latter is our Global Delivery Organization (GDO) hub, employing over 130 professionals across both Project Delivery (Project Services and Creative Sales Services) and Corporate Functions (HR, IT, Accounting, Payroll, and Financial Planning & Analysis).

For our team in Krakow we are currently seeking an experienced Accounts Payable Specialist / Księgowy (Ksiegowa) ds. Dokumentów Zakupu.

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

Responsibilities:

• Calculating and reporting on AP data for submission to government agencies in various jurisdictions across the globe (e.g. UK Cabinet Office re UK Prompt Payment regulation)

• Resolving accounting, tax or regulatory issues specific for the most complex jurisdictions 

• Fulfilling the role of process Subject Matter Expert in selected Accounts Payable area

• Performing testing and implementation of new system enhancements as needed

• Supporting team leader in some of his duties (helping with organizing and monitoring work of the team)

• Being actively involved in seeking resolution of complex issues

• Playing active role in process improvement activities

• Being involved in preparation and maintenance of Training Curriculum for selected AP roles as well as provide training for new joiners

• Playing significant role in updating desktop manuals and working instructions, ensuring compliance with both company’s policies and procedures but also generally accepted accounting standards

• Providing additional, ad hoc trainings and accounting treatment advice to existing employees, if needed

• As a Subject Matter Expert, conducting regular process update & accounting/tax/regulatory update sessions (knowledge sharing on procedure or process or regulatory changes, issues, exceptions, system updates, other, as needed)

• Supporting the Supervisor in analyzing reports showing internal errors in selected areas (and addressing them through additional coaching/training provided to other team members

• Monitoring internal Issue Log and coordinating implementation of appropriate action plans (e.g. additional coaching/training)

• Supporting the Supervisor in analyzing selected process monitoring reports, creating and executing relevant action plans, where necessary

• Being a point of contact for less experienced team members on day-to-day processing issues, exceptions, proper accounting treatment and non-standard items

• Being a backup for majority of the roles within the team

• Helping to manage security access rights to AP systems and tools, where relevant

Requirements:

• Several years of experience within accounts payable environment

• Ability to identify issues, analyse possible solutions and resolve complex problems

• Ability to organize and prioritize workloads 

• Good verbal and written communication skills

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 7:30–10:00)

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

• Hybrid or stationary working model — based on your preference

• 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:

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:

05/11/2026 - 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.