At Fujitsu, our purpose is to make the world more sustainable by building trust in society through innovation. Founded in Japan in 1935, Fujitsu has been a pioneer in technology and innovation for decades. Today, as a world-leading digital transformation partner, we are committed to transforming business and society in the digital age.

With approximately 130,000 employees across over 50 countries, Fujitsu offers a broad range of products, services, and solutions. We collaborate with our customers to co-create solutions that drive enterprise-wide digitalization while actively working to address social issues and contribute to the United Nations Sustainable Development Goals (SDGs).

About the role:

As a Systems Engineer within the Security Operations Center (SOC), you will maintain and secure Linux-based systems in high-availability environments while ensuring stability and performance. You will monitor and troubleshoot infrastructure, manage core services and network components, and support automation and virtualization - working in a fast-paced SOC environment with real impact on critical systems.

Key Responsibilities:

• Administer and maintain Linux systems (RHEL, Ubuntu, Debian, CentOS) in high-availability environments;
• Monitor systems (availability, performance, capacity, security) in a SOC/NOC context;
• Troubleshoot complex issues across OS, network, storage, and applications;
• Manage core services (SSH, systemd, Nginx, Apache, Tomcat, DNS, DHCP, NFS, etc.);
• Configure and maintain:
• Network devices (switches)
• Firewalls: Check Point and Palo Alto
• Implement security best practices (hardening, patching, access control, firewalls);
• Manage storage (LVM, RAID, iSCSI, filesystems) and backup lifecycle (execution, validation, recovery);
• Automate tasks using Bash, Python, Ansible or similar tools;
• Support virtualized environments (VMware, Proxmox);
• Produce technical documentation (runbooks, procedures, diagrams);
• Propose improvements in security, performance, and scalability.

What we are looking for:

• Strong experience in Linux administration (enterprise environments);
• Experience in NOC/SOC or 24x7 operations;
• Hands-on experience with:
• Networking fundamentals (TCP/IP, DNS, DHCP)
• Check Point and Palo Alto firewalls
• Virtualization platforms
• Scripting/automation skills (Bash, Python, Ansible).

Bonus if you have:

• Linux certifications (RHCSA, RHCE, LPIC);
• Experience with monitoring tools (Zabbix, Prometheus, Grafana);
• Knowledge of Zero Trust security models;
• Exposure to cloud or container platforms.

Work Model:

• Hybrid model;
• Regular on-site presence at client offices in Lisbon;
• Possible on-call / operational support rotation.