Infrastructure Specialist

About the role

The Infrastructure Specialist will own the design, implementation, and ongoing management of our Unix/Linux server estate. You will ensure systems are secure, highly available, and aligned with business continuity requirements across on‑premise data centres and cloud environments.

Key responsibilities

• Build, provision and maintain Linux (RHEL/CentOS/Ubuntu) and AIX servers, integrating them with domain/LDAP and applying CIS hardening.
• Execute patch cycles (yum/dnf for Linux, SUMA/NIM for AIX), validate services post‑patch and document compliance evidence.
• Monitor OS and VM health, tune thresholds, and reduce alert noise using syslog, journal, errpt and performance counters.
• Troubleshoot identity integration (SSSD, PAM, Kerberos), SSH key management and name resolution issues.
• Manage TLS/certificate bindings, enforce least‑privilege access and secure service accounts.
• Administer the primary backup solution, run restore tests and support disaster‑recovery exercises.
• Track end‑of‑life OS/hardware, plan upgrades and coordinate migrations with stakeholders.
• Lead incident response, root‑cause analysis and produce post‑incident reports.
• Maintain VMware vSphere/ESXi and IBM PowerVM/LPAR virtualization layers, as well as Unix HA clusters (HACMP/PowerHA, Pacemaker/Corosync).
• Collaborate with application, network, storage and cloud teams to support service integrations.
• Keep runbooks, diagrams and CMDB data up to date; provide weekly KPI reports.
• Manage vendor relationships and oversee secure decommissioning of legacy hardware.
• Mentor engineers, manage workload, prioritize Jira tickets and organise on‑call rota.

Required profile

• Strong background in Unix/Linux system administration (RHEL, CentOS, Ubuntu, AIX).
• Proven experience with patch management, security hardening and compliance reporting.
• Hands‑on experience with virtualization (VMware, PowerVM) and HA clustering technologies.
• Ability to lead incident response, conduct root‑cause analysis and mentor junior staff.

Required skills

• Linux (RHEL/CentOS/Ubuntu) and AIX administration
• LDAP/Active Directory integration, SSSD, PAM, Kerberos
• yum, dnf, SUMA, NIM patching tools
• Monitoring tools and performance utilities (sar, iostat, vmstat, nmon)
• TLS/SSL certificate management
• Backup solutions and DR testing
• VMware vSphere/ESXi, IBM PowerVM/LPAR
• HA clustering (HACMP/PowerHA, Pacemaker, Corosync)
• NFS, storage provisioning, network troubleshooting
• CMDB documentation, Jira ticketing, on‑call rotation management