Unix Systems Engineer

Location: Lisbon, Lisbon, pt

Company Description

Inetum is a European leader in digital services. Inetum’s team of 28,000 consultants and specialists strive every day to make a digital impact for businesses, public sector entities and society. Inetum’s solutions aim at contributing to its clients’ performance and innovation as well as the common good.

Present in 19 countries with a dense network of sites, Inetum partners with major software publishers to meet the challenges of digital transformation with proximity and flexibility.

Driven by its ambition for growth and scale, Inetum generated sales of 2.5 billion euros in 2023.

Job Description

We are seeking a highly skilled and experienced Linux/Unix System Administrator to join our IT team. The ideal candidate will be responsible for the administration, configuration, and maintenance of our Unix-based systems. This role requires deep technical knowledge of Unix operating systems, as well as strong problem-solving and communication skills.

The role requires hands-on expertise with enterprise Unix/Linux platforms, specifically IBM AIX, Red Hat Enterprise Linux (RHEL) and Debian, including production operations, troubleshooting, patching, automation, security hardening and high-availability clustering.

Act as a Level 3 technical reference for Unix/Linux infrastructure, including AIX/RHEL/Debian internals, storage/filesystems, networking, authentication, backup/restore, performance tuning and cluster technologies such as HP Serviceguard, Bull ARF, Pacemaker and Corosync.

Responsibilities:

• Administer and support AIX, RHEL, and Debian systems (installation, configuration, patching, upgrades)
• Manage high availability environments (HP Serviceguard, Pacemaker/Corosync, Bull ARF)
• Perform advanced troubleshooting and performance analysis (CPU, memory, I/O, network, kernel, applications)
• Implement and maintain security and hardening standards (SSH, sudo, PAM, firewalls, SELinux, auditing, access control)
• Support backup and disaster recovery (mksysb, NIM, restores, DR testing)
• Automate tasks using Bash/KSH/Python and Ansible
• Participate in on-call rotation and DR/failover validation
• Collaborate with cross-functional teams (DBA, application, storage, network, security)
• Maintain technical documentation and runbooks

Qualifications

• 5–10+ years of experience in Unix/Linux production environments
• Strong expertise in:
  • IBM AIX (LPAR, VIOS, NIM, LVM, JFS2)
  • RHEL and Debian
• Solid knowledge of:
  • HA clustering, storage (SAN/NAS, multipath), networking (TCP/IP, DNS, VLANs)
  • Advanced system troubleshooting
• Scripting and automation experience (Ansible preferred)
• Strong understanding of system security and compliance
• Fluent in Portuguese and English

Nice to Have

• VMware
• Cloud platforms (AWS, Azure, GCP)
• Monitoring tools (Icinga, ScienceLogic)
• Containers (Docker, Kubernetes)

Additional Information