HR Generalist - UK & Slovakia in London

We are currently seeking an HR Generalist to take ownership of end-to-end HR operations across the United Kingdom and Slovakia, while supporting additional European countries 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.

• Act as the primary HR contact for employees and managers in the UK and Slovakia, 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.
• Coordinate with payroll teams and providers to ensure timely and accurate payroll inputs and issue resolution.
• Ensure compliance with UK and Slovak labour laws 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 elevate complex cases where appropriate.
• Support headcount tracking, reporting, and workforce data management.
• Identify process gaps and contribute to standardisation, simplification, and automation initiatives.
• Collaborate cross-functionally with HR, Payroll, TA, Finance, and Legal teams.

• 4–6 years of experience in 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 Slovak 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.
• Fluency in Slovak.
• Proficiency in HR systems and Excel; experience with payroll coordination.

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

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.