Linux Administrator (SME)

1. Job Summary

We are looking for a highly experienced Linux System Administrator / SME to lead and provide advanced technical expertise in managing enterprise Linux infrastructure. The candidate will be responsible for complex troubleshooting, infrastructure stability, performance optimisation, security compliance, automation and technical guidance to infrastructure operations teams.

The ideal candidate should have deep hands-on expertise in Red Hat Enterprise Linux (RHEL), Unix/Linux administration, enterprise server environments and L2/L3 production support.

2. Key Responsibilities

• Act as the Linux Infrastructure SME and provide technical leadership for enterprise Linux environments.

• Manage, administer and support large-scale Linux server infrastructure.

• Provide advanced L2/L3 support and resolve complex OS-level incidents.

• Perform Linux installation, configuration, upgrades, migration and patch management.

• Manage RHEL, CentOS, Ubuntu and SUSE Linux environments.

• Troubleshoot system performance, kernel issues, memory, CPU, disk and filesystem problems.

• Manage storage, LVM, RAID, NFS, multipathing and filesystem configurations.

• Implement and maintain high availability, clustering and disaster recovery solutions.

• Perform OS hardening, vulnerability remediation and security compliance activities.

• Develop and implement automation using Ansible, Shell scripting and Python.

• Lead root cause analysis (RCA) for critical incidents and recurring infrastructure issues.

• Establish Linux administration standards, operational procedures and best practices.

• Collaborate with network, storage, database, security and application teams.

• Mentor junior Linux administrators and provide technical guidance.

• Participate in infrastructure transformation, migration and technology upgrade initiatives.

3. Mandatory Technical Skills

Technical Area

Required Expertise

Linux OS

RHEL 7/8/9, CentOS, Ubuntu, SUSE

Linux Administration

Advanced OS administration and troubleshooting

Kernel

Kernel management, tuning and troubleshooting

Storage

LVM, RAID, NFS, SAN, multipathing

Networking

TCP/IP, DNS, DHCP, SSH, routing

Clustering

High Availability, Pacemaker, Corosync

Scripting

Bash, Shell scripting, Python

Automation

Ansible, configuration management

Performance

CPU, memory, I/O and system performance tuning

Security

OS hardening, patching, vulnerability management

Virtualisation

VMware, KVM

4. Good to Have

• RHCSA / RHCE / RHCA certifications.

• Experience with Red Hat Satellite.

• Exposure to Docker and Kubernetes.

• Experience with AWS / Azure cloud infrastructure.

• Knowledge of monitoring tools such as Nagios, Zabbix, Prometheus and Grafana.

• Experience with enterprise backup and recovery solutions.

• Exposure to DevOps and infrastructure automation practices.