Unix Systems Engineer

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)