Linux Administrator (SME)

TECHEDGE-SOLUTION PRIVATE LIMITED; Singapore; On-site; SGD 120,000 - 170,000; Full time

Job summary

TECHEDGE-SOLUTION PRIVATE LIMITED is seeking a highly experienced Linux System Administrator/SME to lead enterprise Linux infrastructure in Singapore. You will handle advanced troubleshooting, performance optimization, security compliance and automation, guiding operations teams.

The role requires deep hands-on expertise in RHEL, Unix/Linux administration, and managing large-scale production environments with L2/L3 support. On-site work in Singapore is expected.

Qualifications

• Must have hands-on Linux administration and OS troubleshooting
• Strong experience with RHEL/CentOS/Ubuntu/SUSE environments
• Kernel tuning and performance optimization expertise
• Storage concepts: LVM/RAID/NFS/SAN, multipathing
• Security hardening and patch management practices
• Automation and configuration management with Ansible

Responsibilities

• Act as Linux Infrastructure SME and provide technical leadership for enterprise Linux environments.
• Manage, administer and support large-scale Linux server infrastructure.
• Provide advanced L2/L3 OS-level incident resolution.
• Perform Linux installation, configuration, upgrades, migration and patch management.
• Manage RHEL, CentOS, Ubuntu and SUSE environments.
• Troubleshoot system performance, kernel issues, memory, CPU, disk and filesystem problems.
• Manage storage, LVM, RAID, NFS, SAN, 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.

Tools

VMware

KVM

Docker

Kubernetes

Nagios

Zabbix

Grafana

Prometheus

Ansible

Job description

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

• 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.