HR Administration & Payroll Specialist

Bull is a story. One with a century of European innovation and a working environment where experts design powerful, sustainable, and sovereign digital solutions, enabling states and industries to retain full control over their data and their AI.

Bull is also thousands of engineers, researchers and passionate tech people shaping the future of high‑performance computing, AI, and quantum technologies.

Every day, our teams push the boundaries of what is technologically possible – from next‑generation HPC architectures to exascale supercomputers – supported by world‑class R&D, more than 1,600 patents, and unique end‑to‑end capabilities spanning hardware design, software engineering, data science and quantum research.

We are a people‑centric, innovation‑driven company, where collaboration spans Europe, the Americas and India. We share a common vision of a responsible and sustainable innovation that delivers concrete impact for our customers.

We are looking for an HR Administration & Payroll Specialist to join Bull’s Human Resources team. The role is responsible for managing payroll and personnel administration activities, ensuring accurate payroll processing, compliance with labor and tax regulations, employee data management, and the administration of employment-related processes throughout the employee lifecycle. The successful candidate will also support additional HR processes and contribute to delivering a high-quality employee experience. 

Responsibilities

• Manage end-to-end payroll administration, ensuring accuracy and timely processing.
• Maintain employee records and HR documentation throughout the employee lifecycle.
• Administer employment contracts, amendments, terminations, and other personnel-related documentation.
• Ensure compliance with labor law, tax regulations, and internal HR policies.
• Manage employee data within HR systems and ensure data accuracy and confidentiality.
• Support onboarding, offboarding, and employee administration processes.
• Respond to employee queries related to payroll, personnel administration, and HR processes.
• Collaborate with internal stakeholders and external providers to ensure smooth HR operations.
• Support other HR administration activities and contribute to continuous process improvements.

What We're Looking For 

Experience & Education

• Experience: 3+ years of experience in Payroll and Personnel Administration.
• Education: Bachelor's Degree in Human Resources, Business Administration, Economics, or a related field.

Competences & Skills

• Solid experience in payroll processing and payroll administration.
• Strong knowledge of personnel administration and employee lifecycle processes.
• Understanding of labor legislation and payroll-related compliance requirements.
• Experience working with HRIS systems; Experience with SAP SucessFactor and SAP HR at expert user level.
• Strong attention to detail and ability to work accurately with sensitive employee data.
• Good organizational skills and ability to manage multiple priorities.
• Proficiency with Microsoft Office tools, particularly Excel.

Personal Skills

• Strong interpersonal and communication skills.
• Customer-oriented mindset with the ability to support employees and stakeholders professionally.
• Ability to work independently as well as collaboratively within an international environment.
• Language agility: Professional proficiency in both English and Spanish.

Location

• Madrid, Spain

Benefits

• Flexible Work Schedule; Half day Fridays and an intensive summer workday supporting work life balance.
• Learning and Growth Opportunities within an international and collaborative HR environment.

#Bull

Here, your ideas, your curiosity and your technical excellence directly shape the next era of advanced computing - unlocking enterprise value, accelerating scientific progress and driving positive impact for society.