System Administrator

Quesscorp Singapore Pte Ltd; Singapore; On-site; SGD 80,000 - 120,000; Full time

Job summary

Quesscorp Singapore Pte Ltd is seeking a skilled Unix/Linux Administrator with 6-8 years of hands-on experience to manage enterprise Unix/Linux environments, including Red Hat, AIX, and Solaris systems.

The role focuses on ensuring system resilience, DR testing, RCA of incidents, and coordinating with infrastructure teams. The candidate will provide 24x7 on-call support and maintain documentation for operational procedures, knowledge articles, and stakeholder communication.

Qualifications

• 6-8 years of hands-on Unix/Linux system administration and production support.
• Strong Unix/Linux administration and troubleshooting skills.
• Experience with filesystem/LVM, processes, services, networking, and user administration.

Responsibilities

• Perform service recovery for Unix/Linux systems to minimize downtime.
• Troubleshoot OS, CPU, memory, filesystem, network, and performance issues.
• Manage production incidents and participate in incident recovery and RCA.
• Conduct Disaster Recovery (DR) testing in coordination with infrastructure teams.
• Monitor server health, capacity, availability and performance.
• Provide 24x7 on-call support during assigned shifts and respond to severity 1 incidents.
• Coordinate with application, database, network, and storage teams; maintain operational procedures and documentation.

Skills

RedHat Linux

AIX

Solaris Operating System

Education

Degree/Diploma in IT/CS

Tools

VMware ESX

Network

Storage

Geneos

Splunk

Job description

We are seeking a skilled and proactive Unix/Linux Administrator with 6-8 years of hands-on experience in managing enterprise Unix/Linux environments. The ideal candidate will have strong expertise in Red Hat, AIX, and Solaris systems, along with a good understanding of VMware ESX / Network / Storage technologies. This role is focused on ensuring system resilience through effective service recovery, disaster recovery (DR) testing, and root cause analysis (RCA) of incidents.

• Perform service recovery for Unix/Linux systems to ensure minimal downtime and business continuity.
• Troubleshoot OS, CPU, memory, filesystem, network, and performance-related issues.
• Manage production incidents and participate in incident recovery and root cause analysis.
• Conduct Disaster Recovery (DR) testing in coordination with business and infrastructure teams.
• Monitor server health, capacity, availability, and performance.
• Involved in Root Cause Analysis (RCA) investigations for critical incidents.
• Administer and maintain servers (Red Hat, AIX, Solaris) in production and DR environments.
• Coordinate with application, database, network, storage, and other infrastructure teams.
• Maintain operational procedures, technical documentation, and knowledge articles.
• Provide 24x7 on-call support during assigned shifts and respond to severity 1 incidents under pressure.
• Communicate effectively with stakeholders during high-impact incidents and recovery efforts.
• Worked with L1 in monitoring system performance and proactively addressing potential issues.

Key Domain/ Technical Skills:

• RedHat Linux, AIX, Solaris Operating System.
• VMware ESX, Network, Storage.
• Geneos, Splunk, ing is a plus.

Required Skills:

• Degree/Diploma in Information Technology/Computer Science or equivalent
• 6-8 years of experience in Unix/Linux system administration and production support.
• Strong Unix/Linux administration and troubleshooting skills.
• Knowledge of filesystem/LVM, processes, services, networking, user administration, and shell ing.
• Experience with Incident, Problem, and Change Management processes.
• Good analytical, troubleshooting, communication, and coordination skills.

Good to Have:

• Good knowledge of ITIL processes, incident management and RCA methodologies.
• VMware/virtualization knowledge.
• Storage technologies such as SAN, LUN, and multipathing.
• Experience working in a bank is a plus