About this role
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 AnsibleParticipate in on-call rotation and DR/failover validationCollaborate with cross-functional teams (DBA, application, storage, network, security)Maintain technical documentation and runbooks 5–10+ years of experience in Unix/Linux production environmentsStrong expertise in:IBM AIX (LPAR, VIOS, NIM, LVM, JFS2)RHEL and DebianSolid knowledge of:HA clustering, storage (SAN/NAS, multipath), networking (TCP/IP, DNS, VLANs)Advanced system troubleshootingScripting and automation experience (Ansible preferred)Strong understanding of system security and complianceFluent in Portuguese and EnglishNice to Have
VMwareCloud platforms (AWS, Azure, GCP)Monitoring tools (Icinga, ScienceLogic)Containers (Docker, Kubernetes)