HR Generalist - UK

We are currently seeking an HR Generalist to take ownership of end-to-end HR operations across the United Kingdom, while supporting additional European countries and the US as needed. In this role, you will be instrumental in driving ARIS's mission to stabilise and scale HR operations following its post-carve-out transformation.

Reporting directly to the CPO, you will act as the primary HR point of contact for your markets, working closely with Regional HR, Payroll, Talent Acquisition, Finance, and Legal teams.

This is a high-impact role offering strong ownership, visibility, and the opportunity to shape a more efficient, data-driven, and scalable HR operating model across Europe. If you enjoy building structure, improving processes, and working in an international environment, this role offers a unique platform to make a tangible difference.

Essential Functions

• Act as the primary HR owner for payroll activities in the UK, coordinating monthly processing with external payroll providers and internal stakeholders.
• Validate payroll inputs and outputs, ensuring accuracy, compliance, and timely delivery.
• Manage payroll-related employee inquiries and resolve issues effectively.
• Act as the primary HR contact for employees and managers in the UK, with additional support across Europe as required.
• Manage the full employee lifecycle (onboarding, contract changes, absences, offboarding) with a strong focus on accuracy and execution.
• Ensure compliance with UK labour law and internal HR policies.
• Maintain accurate employee data across HR systems and documentation.
• Prepare employment contracts, amendments, HR letters, and related documentation.
• Support managers and employees on HR processes, policies, and operational topics.
• Handle employee relations matters and escalat ion complex cases where appropriate.
• Support headcount tracking, reporting, and workforce data management.
• Identify process gaps and contribute to standardisation, simplification, and automation initiatives.
• 4-6 years of experience in Payroll, HR operations, HR administration, or a generalist HR role in an international environment.
• Bachelor's degree in Human Resources, Business Administration, or a related field.
• Solid understanding of employee lifecycle processes and HR administration.
• Exposure to UK HR practices and labour law.
• Strong ownership mindset and ability to independently manage a defined country scope.
• High attention to detail, reliability, and confidentiality.
• Strong communication skills in English.
• Proficiency in HR systems and Excel.

Nice to Haves

• Experience supporting multiple countries across Europe and the US.
• Experience working in a transformation or post-carve out environment.
• Exposure to HR process improvement, automation, or scaling initiatives.

What We Offer

• Competitive salary package with specific country benefits.
• Hybrid work model (3 days/week from the office).
• A critical, hands on role in a transforming HR Operations environment.
• High responsibility combined with a pragmatic, operational focus.
• The opportunity to actively shape HR operations and payroll input processes in a modern HRIS landscape.

At SAG Aris GmbH we are committed to providing an environment of mutual respect and fairness where equal employment opportunities are available to all applicants and employees without regard to race, colour, religion, gender, pregnancy, national origin, age, physical and mental disability, marital status, sexual orientation, gender identity, and any other characteristic protected by applicable law.

We believe that diversity, equity, and inclusion is critical to our success as a global company, and we seek to recruit, compensate, develop, promote, and retain the most talented people from a diverse candidate pool.