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 UK HR Services Specialist/ Specjalista/ Specjalistka ds. Obsługi Pracowników UK.

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

Responsibilities

Utilizes knowledge management system to respond to requests from HR staff, managers and employees on HR or Payroll policies, procedures, and tools
Cooperates with Payroll and other HR teams on queries received by the team
Navigates on company’s systems and tools and explains their functionality
Processes information, data, transactions, and letter related to HR or Payroll data
Tracks customer contacts and inquiries in case management system
Monitors case management system and reassigns tasks to appropriate teams
Escalates necessary matters to policy owners for resolution
Possesses strong interpersonal skills to successfully build productive relationships at all levels of the enterprise
Conveys a professional, knowledgeable, helpful and confidential approach
Participates in special tasks and projects in order to support supervisors, teams and other stakeholders

Requirements

1 year in HR or Payroll, or in a call center environment
Proficiency with Microsoft applications
Experience in using Workday would be an asset
Excellent spoken and written English
Bachelor’s Degree or equivalent experience
Numerical attitude/analytical skills
Knowledge of HR or Payroll policies and processes
Ability to handle confidential issues with discretion
Customer service experience

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:

07/21/2026 - 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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