Linux System Administrator

Job Overview

Join VUI Systems Pte. Ltd. in Singapore as a Linux System Administrator to manage and maintain Linux server environments, especially focusing on Red Hat Enterprise Linux and other distributions. You will ensure system reliability, security, and performance as well as support enterprise-level infrastructure needs.

Key Responsibilities

• Install, configure, administer, and support Linux servers, primarily RHEL and other Linux variants.
• Carry out daily Linux administration duties including managing users and groups, handling file systems, permissions, services, and system configurations.
• Manage the lifecycle of servers—from provisioning and upgrades to migrations and decommissioning.
• Regularly apply OS patches, address vulnerabilities, conduct security hardening and ensure compliance with CIS standards.
• Monitor server health indicators such as availability, CPU, memory, disk space, filesystems, and network performance.
• Troubleshoot incidents involving Linux OS, connectivity, application performance, storage, and network issues.
• Investigate root causes for repeated or severe incidents and implement effective long-term solutions.
• Handle Logical Volume Management (LVM), filesystem adjustments, mount points, NFS, and storage configurations.
• Support access control and authentication systems including LDAP, Active Directory, Kerberos, SSH, sudo, and PAM.
• Configure and resolve issues related to Linux networking, including DNS, routing, firewall rules, and ports.
• Develop and update Shell/Bash scripts to streamline operational and administrative tasks.
• Support monitoring, backup, enterprise scheduling, security, and other infrastructure management tools.
• Maintain standards for server builds, maintain documentation for operations, architecture, inventory, and detailed runbooks.
• Engage in processes for incident, problem, change, vulnerability, and capacity management.
• Assist with disaster recovery drills, verifying backup and recovery processes, and supporting business continuity plans.
• Provide production support including handling critical incidents and planned maintenance activities.

Technical Skills

• Strong proficiency in RHEL/Linux system administration and related tools such as RPM/YUM/DNF.
• Experience in Bash/Shell scripting for automation of operational tasks.
• Knowledge of system components including LVM, NFS, SSH, sudo, TCP/IP networking, DNS, LDAP, Kerberos, and PAM.
• Expertise in performance troubleshooting, patch management, vulnerability remediation, and security hardening.
• Familiarity with virtualization platforms like VMware and Nutanix, cloud platforms such as AWS, and configuration management tools like Ansible.
• Understanding of monitoring solutions, CyberArk security tools, backup technologies, and enterprise job schedulers.

Qualifications & Experience

• Diploma or degree in Computer Science, Information Technology, Engineering, or a similar technical field.
• Minimum of 5 years’ practical experience in Linux system administration within enterprise or production environments.
• Certifications such as RHCSA or RHCE, or equivalent credentials, are preferred.