Inetum

Global IT services for digital transformation

Unix Systems Engineer

System AdministrationConfirmed live in the last 24 hours

Full-timeLisbon, PortugalNo salary listedHybrid

About the Job

Requirements

At least 5 years of experience in Unix/Linux production environments.
Strong expertise in IBM AIX, including LPAR, VIOS, NIM, LVM, and JFS2.
Strong expertise in Red Hat Enterprise Linux and Debian.
Knowledge of high-availability clustering, storage including SAN/NAS and multipath, and networking including TCP/IP, DNS, and VLANs.
Experience with advanced system troubleshooting.
Scripting and automation experience.
Understanding of system security and compliance.
Fluency in Portuguese and English.

Responsibilities

Administer and support AIX, Red Hat Enterprise Linux, and Debian systems, including installation, configuration, patching, and upgrades.
Manage high-availability environments using HP Serviceguard, Pacemaker/Corosync, and Bull ARF.
Perform advanced troubleshooting and performance analysis across CPU, memory, I/O, network, kernel, and applications.
Implement and maintain security and hardening standards for SSH, sudo, PAM, firewalls, SELinux, auditing, and access control.
Support backup and disaster recovery, including mksysb, NIM, restores, and disaster-recovery testing.
Automate tasks using Bash, KSH, Python, and Ansible.
Participate in the on-call rotation and disaster-recovery/failover validation.
Collaborate with DBA, application, storage, network, and security teams.
Maintain technical documentation and runbooks.
Act as a Level 3 technical reference for Unix/Linux infrastructure, including AIX, RHEL, and Debian internals, storage/filesystems, networking, authentication, backup/restore, performance tuning, and cluster technologies.

Desired Qualifications

Experience with Ansible.
Experience with VMware.
Experience with cloud platforms including AWS, Azure, or GCP.
Experience with monitoring tools including Icinga or ScienceLogic.
Experience with containers including Docker or Kubernetes.

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

About the Company

Inetum

Global IT services for digital transformation

Inetum provides IT services for digital transformation in 26 countries, serving enterprises, SMEs, and public sector clients. It offers cybersecurity, cloud computing, predictive maintenance, and augmented reality, delivered through consulting, managed services, and proprietary software. It differentiates itself through a broad service portfolio, strategic partnerships with Microsoft and Sage, and a focus on tailoring solutions to fit each client’s needs. Its goal is to help clients adapt to a changing digital landscape, improving business agility and creating economic, managerial, and social opportunities.

Company size: 1,001-5,000
Company stage: IPO
Headquarters: Saint-Ouen, France
Founded: 1995

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