Senior Payroll Specialist Starszy Specjalista Starsza Specjalistka ds. Płac

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.

We are looking for an experienced and independent Senior Payroll Specialist with strong UK payroll expertise . The ideal candidate will have a proactive, hands-on approach, a strong focus on continuous improvement, and a collaborative mindset, actively supporting colleagues and contributing to team success.

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

Responsibilities

Payroll Processing

• Manage end-to-end payroll activities for assigned countries/entities, ensuring accurate and timely processing of new hires, employee changes, terminations, variable pay elements, and payroll adjustments.
• Review and validate payroll inputs to ensure compliance with internal policies, statutory requirements, and payroll controls.
• Act as a subject matter expert for complex payroll transactions and exception handling.

Payroll Controls, Audits & Compliance

• Perform comprehensive payroll validations and reconciliations, including Gross-to-Net analysis, payment reviews, variance analysis, and payroll
• balancing activities.
• Review and approve payroll outputs provided by external payroll vendors to ensure accuracy, compliance, and adherence to service level agreements.
• Identify payroll discrepancies, conduct root cause analysis, and implement corrective actions to mitigate future risks.

Reporting & Analytics

• Generate, analyse, and maintain payroll reports, metrics, and dashboards to support business, finance, HR, and audit requirements.
• Prepare management reports, statutory reports, payroll statistics, surveys, and ad hoc data analysis to support business decision-making.

Stakeholder Management & Customer Service

• Serve as a key point of contact for employees, HR, Finance, Benefits, Compensation, Tax, and external vendors regarding payroll-related matters.
• Manage complex and escalated payroll inquiries, ensuring timely resolution and a high level of customer satisfaction.
• Build and maintain strong cross-functional partnerships to support payroll operations and business objectives.
• Demonstrates a strong customer service mindset, building trusted relationships with clients through responsive communication, empathy, professionalism, and a proactive approach to resolving issues and delivering solutions. Ensures clients feel supported, informed, and valued throughout every interaction.

Payroll Governance & Year-End Activities

• Support and coordinate month-end, quarter-end, and year-end payroll activities, including wage and tax adjustments, reconciliations, statutory reporting, and audit requirements.
• Ensure compliance with local legislation, internal controls, and company policies across all payroll processes.

Process Improvement & Documentation

• Develop, maintain, and continuously improve payroll process documentation, including standard operating procedures, work instructions, and process flows.
• Drive process improvement initiatives by identifying operational gaps, recommending scalable solutions, and implementing best practices to enhance efficiency and accuracy.

Payroll Expertise & Continuous Improvement

• Utilize advanced payroll knowledge to resolve complex payroll issues and provide guidance on legislative, procedural, and system-related matters.
• Monitor payroll-related changes in legislation and business requirements, assessing potential impacts and recommending appropriate actions.

Leadership, Training & Team Support

• Act as a payroll subject matter expert, providing guidance, mentoring, and training to team members.
• Support the Payroll Supervisor/Manager in coordinating payroll activities and ensuring achievement of team objectives, service levels, and quality standards.
• Act as deputy for the Payroll Supervisor/Manager during periods of absence, ensuring continuity of payroll operations and stakeholder support.

Projects & Vendor Management

• Participate in payroll transformation initiatives, system implementations, process enhancements, and integration projects.
• Support User Acceptance Testing (UAT), coordinate testing activities, document results, and work closely with vendors and internal stakeholders to ensure successful project delivery.

Requirements

• Bachelor's degree in Finance, Accounting, Business Administration, or a related field.
• Fluency in written and spoken English.
• Minimum 4 years of payroll experience, preferably supporting complex and/or global payroll operations for organizations with 1,000+ employees.
• Strong understanding of payroll legislation, compliance requirements, payroll controls, and reconciliation processes.
• Advanced Microsoft Excel skills, including Pivot Tables, XLOOKUP/VLOOKUP, advanced formulas, filtering, sorting, and data analysis.
• Proficiency in Microsoft Word and PowerPoint.
• Demonstrated ability to manage multiple priorities, resolve complex payroll issues, and work effectively with cross-functional stakeholders.
• Experience working with outsourced payroll providers and payroll systems in a multinational environment.
• Strong analytical, problem-solving, communication, and customer service 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

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