L3 Server Infrastructure Lead (Unix/Linux)

About the Role

We are looking for an experienced Unix/Linux Compute Subject Matter Expert to provide L3 technical leadership and operational ownership for a global estate of Unix/Linux server instances. The SME will be accountable for infrastructure stability, availability, security and performance, and will own patching, vulnerability remediation, lifecycle management and continuous improvement across the environment. Working within a follow-the-sun model spanning APAC, EMEA and NLAM, the role guides L1/L2 teams and partners closely with Security, Database, Storage, Network, Cloud and Application teams to deliver a consistent, high-quality service.

Key Roles and Responsibilities

• Provide L3 technical support for P1–P4 incidents and complex OS-level issues.
• Lead and technically guide L1/L2 Unix/Linux operations teams across global regions.
• Administer and troubleshoot RHEL, Ubuntu, AIX and Solaris environments.
• Own OS patching, patch compliance and vulnerability remediation.
• Perform CIS hardening and security baseline remediation.
• Manage OS performance and capacity, including filesystem, CPU, memory and I/O issues.
• Support server build, configuration, lifecycle and decommissioning activities.
• Drive problem management, root cause analysis (RCA) and permanent corrective actions.
• Support monitoring, disaster recovery (DR) activities and operational readiness.
• Develop and maintain operational runbooks, procedures and technical documentation.
• Identify and implement automation opportunities to improve operational efficiency.
• Collaborate with Security, Database, Storage/Backup, Network, Cloud and Application teams.
• Ensure consistent service delivery through the APAC–EMEA–NLAM follow-the-sun operating model.

Basic Qualifications

• 8–12+ years of experience in enterprise Unix/Linux infrastructure and production operations.
• Strong hands-on experience in Unix/Linux system administration.
• Expert knowledge of one or more of: RHEL, Ubuntu, AIX, Solaris.
• Strong troubleshooting skills across OS, filesystem, process, performance and system services.
• Experience with OS patching, vulnerability remediation and CIS hardening.
• Strong knowledge of LVM, NFS, SSH, DNS, filesystem management, package management and cron.
• Experience in enterprise 24x7 production operations.
• Strong ITIL-based Incident, Problem and Change Management experience.
• Experience leading and mentoring L1/L2 teams and handling major incidents.
• Strong scripting and automation skills using Shell, Python, Ansible or equivalent.

Preferred Qualifications

• Red Hat RHCSA / RHCE certification.
• Experience with enterprise monitoring and patch-management tools.
• ServiceNow or other ITSM platform experience.
• Knowledge of VMware, AWS/Azure, and Backup/DR solutions.
• Experience working in a global follow-the-sun support model.