Systems, Network, Cybersecurity & Industrial Applications Administrator (M/F)

Location: Luxembourg
Employment Type: Permanent Contract (Full-Time)
Department: Information Technology (IT)

About ArcelorMittal WireSolutions

ArcelorMittal WireSolutions is an international industrial group committed to innovation, operational excellence, and digital transformation. As part of our ongoing efforts to modernize IT infrastructure, strengthen cybersecurity, expand cloud capabilities, and accelerate the digitalization of industrial operations, we are seeking a Systems, Network, Cybersecurity & Industrial Applications Administrator to join our team in Luxembourg.

This role offers a unique opportunity to work across IT infrastructure, networking, cybersecurity, cloud technologies, enterprise applications, and Industry 4.0 initiatives within a dynamic international manufacturing environment.

Your Mission

As part of the IT team, you will contribute to the operation, security, and continuous improvement of the Group's infrastructure and business applications. You will work across multiple technology domains, helping ensure the reliability, performance, and security of critical IT and industrial systems.

This position is ideal for a versatile IT professional who wants to broaden their expertise across infrastructure, cybersecurity, cloud platforms, enterprise applications, and industrial technologies.

Key Responsibilities Systems Administration & Active Directory

• Administer and maintain Windows Server environments.
• Manage user accounts, security groups, permissions, and access rights.
• Participate in Active Directory remediation and security enhancement projects.
• Support Identity & Access Management (IAM) compliance initiatives.
• Maintain and improve server infrastructure performance and reliability.

Multi-Site Network Administration

• Support the operation and administration of network infrastructures across multiple locations.
• Maintain network inventories, architecture documentation, and technical records.
• Assist with the deployment and management of switches, wireless networks, and network equipment.
• Contribute to network segmentation and infrastructure modernization projects.
• Troubleshoot and resolve WAN, LAN, and Wi-Fi issues.

Operational Cybersecurity

• Monitor vulnerabilities identified through security assessment tools.
• Support remediation planning and execution activities.
• Verify security compliance of servers, endpoints, and network devices.
• Participate in SecOps initiatives and cybersecurity governance activities.
• Contribute to strengthening the Group's cybersecurity posture.

Patch Management & Infrastructure Hardening

• Coordinate operating system, BIOS, firmware, and driver update activities.
• Monitor patching compliance and identify remediation opportunities.
• Produce and analyze compliance metrics and reports.
• Participate in infrastructure hardening and security improvement initiatives.

Cloud Technologies

• Support the administration and enhancement of cloud platforms and services.
• Contribute to infrastructure and application migration projects.
• Assist in cloud governance, security, and documentation activities.
• Promote cloud operational and security best practices.

Business Continuity & Disaster Recovery

• Support the maintenance of IT and OT Disaster Recovery Plans (DRP).
• Participate in restoration testing and business continuity exercises.
• Assist in mapping critical systems, services, and dependencies.
• Help improve service resilience and operational continuity.

Business Applications & Databases

• Provide support for business applications and internally developed solutions.
• Analyze and troubleshoot application-related incidents.
• Assist with support and diagnostics for Microsoft SQL Server environments.
• Execute SQL queries for data validation, reporting, and analysis.
• Support integrations, interfaces, and automated business processes.
• Assist with IBM i / AS400 environments where required.
• Collaborate with development teams, business stakeholders, and external vendors.
• Maintain functional and technical application documentation.

Level 2 IT Support

• Resolve complex technical incidents escalated by service desk teams.
• Coordinate troubleshooting activities with external providers and vendors.
• Conduct root-cause analysis for recurring issues.
• Support continuous service improvement initiatives.

IT Governance & Documentation

• Maintain technical documentation, architecture diagrams, and operational procedures.
• Ensure hardware, software, and application inventories are up to date.
• Document security standards and operational processes.
• Contribute to the development and implementation of Group IT standards.

Industry 4.0 & Operational Technology (OT)

• Support the security and modernization of industrial networks and systems.
• Maintain inventory and mapping of OT assets.
• Participate in IT/OT segmentation initiatives.
• Contribute to industrial cybersecurity projects.
• Support digitalization and Industry 4.0 transformation programs.

Candidate Profile Education

• Bachelor's or Master's Degree in Information Technology, Computer Science, Networking, Cybersecurity, Information Systems, Engineering, or a related discipline.
• Equivalent qualifications and relevant professional experience will also be considered.

Experience

• Minimum 3-5 years of experience in systems, network, or infrastructure administration.
• Experience in a manufacturing, industrial, or multi-site environment is considered an advantage.
• Exposure to cybersecurity, cloud technologies, or business applications is highly desirable.

Technical Skills

Experience or knowledge in several of the following areas is preferred:

• Windows Server Administration
• Active Directory
• TCP/IP Networking, VLANs, Switching, and Wi-Fi Technologies
• Cybersecurity and Vulnerability Management
• Virtualization Technologies
• Cloud Platforms and Services
• Microsoft SQL Server and SQL
• Identity & Access Management (IAM)
• PowerShell or other automation tools
• IBM i / AS400 (considered a plus)

Languages

Required

• Fluent French (written and spoken)
• Fluent English (written and spoken)

As this role works closely with international teams, suppliers, and stakeholders, strong communication skills in both French and English are essential.

Personal Attributes

We are looking for someone who is:

• Technically curious and eager to learn.
• Analytical with strong problem-solving abilities.
• Organized, autonomous, and detail-oriented.
• Able to collaborate effectively with both technical and business stakeholders.
• Interested in industrial environments and digital transformation.
• Motivated to develop expertise across infrastructure, cybersecurity, cloud technologies, and business applications.

Why Join Us?

• Join a leading international industrial organization.
• Work on strategic infrastructure, cybersecurity, cloud, and digital transformation projects.
• Gain exposure to enterprise applications, industrial systems, and Industry 4.0 initiatives.
• Collaborate with experienced professionals in a global environment.
• Access continuous learning and professional development opportunities.
• Build a diverse and valuable skillset across multiple technology domains.
• Benefit from long-term career growth opportunities within ArcelorMittal.

Join Us

If you are a curious and versatile IT professional looking to make an impact in a technologically advanced industrial environment, we would love to hear from you.

ArcelorMittal is the world's leading steel and mining company, with a presence in 60 countries and primary steelmaking facilities in 15 countries. Our material is part of the fabric of life. What we produce makes a difference – to individuals, communities, businesses and society. At ArcelorMittal, the safety, health, and wellbeing of our employees are our top priorities. We believe that every accident is avoidable, and it is essential for every employee, from the shop floor to the management committee, to hold this belief.

Our purpose is to produce ever smarter steels that have a positive benefit for people and planet. Steels made using innovative processes which use less energy, emit significantly less carbon and reduce costs. Steels that are cleaner, stronger and reusable. Steels for electric vehicles and renewable energy infrastructure that will support societies as they transform through this century. With steel at our core, our inventive people and an entrepreneurial culture at heart, we will support the world in making that change. This is what we believe it takes to be the steel company of the future.