Unix Systems Engineer at inetum2 – Lisbon | Jobyssey

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

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)

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