International Mobility Specialist

About Bull

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.

Role Overview

We are looking for an International Mobility Specialist to manage and coordinate employee mobility and cross-border workforce movements for Bull SAS worldwide.

The role covers EU posted worker arrangements, international assignments, short-term assignments, business travel compliance, and other cross-border employment activities. You will act as a key subject matter expert, operating at both strategic and operational levels, while ensuring compliant, efficient, and employee-focused mobility solutions.

The position combines regulatory knowledge, operational execution, stakeholder management, and employee support, with strong focus on compliance, data accuracy, and continuous improvement of global mobility frameworks.

Key Responsibilities:

EU Posted Workers & Cross-Border Mobility Management
Manage end-to-end posted worker processes for employees temporarily assigned to EU countries, ensuring compliance with host-country requirements. Assess posting scenarios and determine applicable compliance needs, including local employment conditions, minimum remuneration, working time rules, social security, documentation, and notification obligations.

Coordinate posted worker notifications/declarations with relevant authorities and manage A1 certificate processes to ensure appropriate social security coverage for posted employees.

Work closely with payroll teams to ensure correct implementation of host-country remuneration requirements, allowances, assignment-related payments, payroll reporting obligations, and shadow payroll requirements where applicable.

Maintain accurate records of posted workers, assignment details, compliance documentation, and audit trails.

Global Mobility Management
Manage and execute end-to-end global mobility processes, ensuring compliance with legal, regulatory, and company policy requirements.

Support assignment lifecycle activities, including collecting information from stakeholders, updating mobility databases such as AssignmentPro/APRO, preparing assignment cost estimates, supporting mobility-related cost projections, preparing assignment documentation, and ensuring data integrity and confidentiality of sensitive employee information.

Follow up with stakeholders to ensure timely completion of all activities and support reporting and analytics.

Policy Design and Implementation
Design and maintain global mobility policies, ensuring compliance with legal, labour, and tax requirements, while supporting practical and efficient execution.

Monitor regulatory changes and proactively adjust policies and processes accordingly. Communicate policies clearly to employees, ensuring understanding of benefits, allowances, and expectations during international assignments.

Vendor Coordination
Collaborate with external vendors, including immigration consultants, relocation agencies, tax consultants, and legal advisors, to ensure smooth international mobility processes.

Monitor vendor performance, service quality, costs, and continuous improvement opportunities.

Employee Support
Act as a point of contact for employees undergoing international assignments, providing guidance on immigration, relocation logistics, and assignment-related topics.

Support employees and their families throughout the assignment lifecycle, including timely insurance enrolment where applicable.

Cross-functional Collaboration
Work closely with HR Business Partners, Workforce Management, Talent Acquisition, Finance, Payroll, Legal, and other stakeholders to ensure a coordinated approach to international mobility aligned with organizational goals.

Risk Management
Identify potential risks related to international mobility and implement mitigation strategies. Escalate issues to management in a timely manner when needed.

Requirements:

• Bachelor’s degree with 3–5 years of experience in International / Global Mobility
• Hands-on experience with EU Posted Workers Directive compliance, including posting notifications, A1 certificates, social security coordination, and host-country employment requirements
• Experience managing end-to-end international assignments and mobility processes
• Good understanding of mobility tools and systems, ideally AssignmentPro/APRO
• Experience working with external vendors, including immigration, relocation, tax, and legal providers
• Good command of English and French, both written and spoken

 

Key Skills

• Solid understanding of international mobility, posted worker requirements, social security coordination, immigration, tax, and compliance frameworks
• Strong communication and stakeholder management skills
• Ability to manage multiple assignments simultaneously in a fast-paced environmentHigh attention to detail and ability to handle sensitive employee data confidentially
• Solution-oriented mindset with strong problem-solving capabilities
• Ability to work effectively with employees, managers, internal stakeholders, and external partners across multiple countries.

    Location: Bulgaria or Romania   

What We Offer

• A dynamic and international working environment.
• Exposure to end‑to‑end order and financial flows within a global organization.
• Opportunities for professional growth, specialization, and internal mobility.
• A collaborative, supportive team culture.

#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.