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.
For our team in Krakow we are seeking a Payroll Specialist, who will focus on the United Kingom.
The selected candidate will be employed by Critical Mission Services Sp. z o.o., part of Amentum.
Responsibilities
Payroll Processing - processing new hires, employee changes, terminations, processing hours and pay for all employees, completing appropriate documentation and checklists accurately and timely.
Payroll Audits - finalize and balance payroll totals using internal tools, perform all necessary reviews and audits to reports produced by outsourced vendors, such us Gross to Net, payment reports, etc.
Reporting – create and modify payroll related reports to support the needs of departments and customers.
Customer Service – provide a consistently high-level of customer service and manage escalated cases and service requests within the SLA requirements. Partner with HR/Accounting/Benefits & Compensation/Tax Department and managers/supervisors to ensure that a strong business relationship is maintained.
Quarter/Year End Support – provide quarter and year-end support in the form of research and review of such things as wage & tax adjustments, out of balance reports, un-reconciled accounts, statutory requirements, etc.
Process Documentation/Training – create/update process documentation to include work instructions and process flows. Assess current processes to streamline and gain efficiency.
Knowledge – knowledge of end-to-end transactions, including highly technical and complex payrolls. Research and find creative solutions to solve payroll issues in an increasingly changing environment.
Teamwork – support other team members as a subject matter expert, mentor, and coach. Participate in team and company initiatives to support the “we” mentality vs. “I”. Work collectively as a team to ensure that we meet our monthly metric goals of processing with minimal errors, worked performed with SLA timeframes and positive employee feedback.
Requirements
Bachelor’s degree in finance
Fluency in English, verbal and written
Minimum 4 years of global payroll experience, with companies having 1,000+ employees
Intermediate to Advanced software skills and experience with Microsoft Excel, including pivots, lookups, filtering and sorting
Basic proficiency and experience with Microsoft Word, Power Point and Visio.
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:
05/05/2026 - 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.
