Unix Systems Engineer

Inetum Portugal; Lisboa; On-site; EUR 50,000 - 78,000; Full time

Job summary

A Inetum Portugal procura um Unix Systems Engineer para administrar, manter e solucionar ambientes Unix/Linux críticos (AIX, RHEL, Debian), assegurando disponibilidade e segurança. Serás o ponto L3 de referência, apoiando sistemas de alta disponibilidade e workloads empresariais.

Deverás automatizar tarefas com Bash, ksh, Python e Ansible, além de colaborar com equipas de DBA, storage, redes e segurança. Participarás em on‑call e em migrações/IU de infra.

Qualifications

• 5–10 anos de experiência em administração Unix/Linux em ambientes empresariais.
• Conhecimento profundo de AIX, RHEL e Debian.
• Conhecimento avançado de internals Unix/Linux: inicialização, serviços, gestão de pacotes, sistemas de ficheiros, LVM, multipath, rede, logs e resolução de performance.
• Experiência prática com clustering de alta disponibilidade (Serviceguard, Bull ARF, Pacemaker/Corosync).
• Sólidos conhecimentos de scripting e automação (Bash, ksh, Python, Ansible).
• Compreensão de segurança, hardening, permissões, PAM/SSH, auditoria e conformidade.
• Conhecimento de redes (TCP/IP, DNS, DHCP, NTP).
• Experiência com VMware ou plataformas de virtualização equivalentes.
• Conhecimento de cloud (AWS, Azure, GCP) é um plus.
• Certificações relevantes (RHCE, LPIC, AIX) são preferidas.
• Fluente em Inglês; Francês ou Holandês são mais-valia.

Responsibilities

• Administrar e solucionar problemas em ambientes Unix/Linux complexos (AIX, RHEL, Debian).
• Instalar, configurar, aplicar patches e atualizar sistemas Unix/Linux e componentes relacionados.
• Operar e suportar clusters de alta disponibilidade (Serviceguard, Bull ARF, Pacemaker/Corosync).
• Executar diagnósticos avançados de desempenho e sistema (CPU, memória, storage, rede, kernel).
• Impor endurecimento de segurança, permissões, políticas SSH/PAM, regras de firewall, auditoria e remediação de vulnerabilidades.
• Integrar Unix/Linux com autenticação corporativa (LDAP/AD, Kerberos, SSSD).
• Executar e validar backups, DR e procedimentos de failover.
• Automatizar tarefas operacionais com Bash, ksh, Python e Ansible.
• Monitorar saúde, capacidade e desempenho, com detecção pró-ativa de problemas.
• Colaborar com equipas de DBA, middleware, aplicações, storage, backup, rede e segurança.
• Criar e manter documentação técnica, runbooks e procedimentos operacionais.
• Fornecer suporte L3 e resolver incidentes complexos em Unix/Linux.
• Participar em turnos de on‑call, assegurando resposta rápida e SLA.
• Planejar e executar migrações de sistemas, upgrades de ciclo de vida e melhorias de infraestrutura.

Skills

Unix/Linux administration

Scripting & automation

Security hardening

On-call incident response

English fluency

Tools

IBM AIX

RHEL

Debian

Serviceguard

Pacemaker/Corosync

Bull ARF

Ansible

VMware

AWS

Azure

GCP

Job description

Unix Systems Engineer

Empresa : Inetum Portugal Tipo de Emprego : Periodo Integral Lisbon, Portugal

Descrição do Emprego - Unix Systems Engineer

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

As a Unix Systems Engineer, you will be responsible for the administration, maintenance, and advanced troubleshooting of critical Unix/Linux environments, ensuring the stability, security, and continuous availability of AIX, RHEL, and Debian platforms across on‑premises and cloud‑adjacent infrastructures. You will act as an L3 technical reference, supporting high‑availability systems, clustered services, and enterprise workloads.

Responsibilities:

• Administer and troubleshoot complex Unix/Linux environments (AIX, RHEL, Debian);

• Install, configure, patch, and upgrade Unix/Linux systems and related components;

• Operate and support high‑availability clusters (HP Serviceguard, Bull ARF, Pacemaker/Corosync);

• Perform advanced performance and system diagnostics across CPU, memory, storage, networking, kernel, and applications;

• Implement security hardening, permissions, SSH/PAM policies, firewall rules, audit logging, and vulnerability remediation;

• Integrate Unix/Linux systems with enterprise authentication (LDAP/AD, Kerberos, SSSD);

• Execute and validate backup, restore, DR, and failover procedures;

• Automate operational tasks using Bash, ksh, Python, and Ansible;

• Monitor system health, capacity, and performance, ensuring proactive issue detection;

• Collaborate with DBA, middleware, application, storage, backup, network, and security teams;

• Create and maintain technical documentation, runbooks, and operational procedures;

• Provide L3 support and resolve complex incidents across Unix/Linux platforms;

• Participate in on‑call rotations, ensuring rapid response and SLA compliance;

• Plan and execute system migrations, lifecycle upgrades, and infrastructure improvements.

Qualifications

• 5–10 years of experience in Unix/Linux administration in enterprise environments;

• Strong expertise in IBM AIX, Red Hat Enterprise Linux (RHEL), and Debian;

• Deep knowledge of Unix/Linux internals: boot process, services, package management, filesystems, LVM, multipath, networking, logging, and performance troubleshooting;

• Hands‑on experience with high‑availability clustering (Serviceguard, Bull ARF, Pacemaker/Corosync);

• Strong scripting and automation skills (Bash, ksh, Python, Ansible);

• Solid understanding of security, hardening, permissions, PAM/SSH, audit frameworks, and compliance;

• Familiarity with network protocols and services (TCP/IP, DNS, DHCP, NTP);

• Experience with VMware or equivalent virtualization platforms;

• Cloud knowledge (AWS, Azure, GCP) is a plus;

• Experience with monitoring and observability tools (Icinga, ScienceLogic, syslog, SNMP);

• Relevant certifications (RHCE, LPIC, AIX) are preferred;

• Fluent English;

• French or Dutch are a plus.