Senior Unix / Linux System Administrator

Charterhouse Pte Ltd; Singapore; On-site; SGD 80,000 - 110,000; Full time

Job summary

A leading technology firm in Singapore seeks a Senior Unix / Linux System Administrator responsible for ensuring stability and performance across critical systems. Ideal candidates will have 8+ years of Unix/Linux expertise, experience with SAN storage, and proficiency in scripting for automation. The position requires excellent problem-solving skills and the ability to provide 24/7 support. Interested applicants should send their CVs to the provided contact email.

Qualifications

• 8+ years of experience in system administration with Unix/Linux expertise.
• Ability to provide 24/7 on-call support.
• Experience with cloud administration certifications preferred.

Responsibilities

• Perform administration and maintenance of Solaris and Linux servers.
• Manage system backups and security compliance.
• Resolve incidents and implement preventive measures.

Skills

Unix/Linux administration

Scripting (Shell, Perl, Python)

Problem-solving

Communication skills

Customer-focused

Education

Bachelor’s degree in Information Technology, Computer Science, or related discipline

Tools

Monitoring tools for large-scale environments

SAN storage for Unix/Linux platforms

Job description

Overview

We are seeking an experienced Senior Unix / Linux System Administrator to join our client's technology team. This role will be responsible for ensuring the stability, security, and performance of our mission-critical systems across production, disaster recovery, and test environments. The ideal candidate will have deep technical expertise in Unix/Linux administration, middleware support, and IT infrastructure operations, with a strong focus on reliability, automation, and continuous improvement.

System Administration & Operations

• Perform administration and maintenance of Sun Solaris and Linux-based servers across production, DR, and test environments.
• Upgrade, patch, and harden operating systems and middleware to ensure compliance and security.
• Manage password and certificate renewals, infrastructure component obsolescence, and system backups.
• Design, implement, and test disaster recovery and business continuity strategies.
• Manage and maintain UAT environments, ensuring availability for testing and project support.
• Develop and maintain technical documentation for systems, middleware, and infrastructure.
• Provide advanced (Level 3) technical support and guidance to end-users and IT teams.

Incident & Problem Management

• Resolve incidents and service requests in line with SLAs.
• Perform root cause analysis and implement preventive measures to improve service stability.

Change & Release Management

• Plan, schedule, and implement system changes following established change management processes.
• Package and deploy application changes using deployment tools.

Configuration & Performance Management

• Maintain a comprehensive system configuration database (CMDB).
• Monitor infrastructure capacity and optimize system performance through tuning and proactive planning.

Process & Project Support

• Design and implement IT service management processes aligned with corporate security standards.
• Support infrastructure enhancement initiatives and provide system support for projects.

Documentation

• Maintain up-to-date technical, operational, and process documentation.

Requirements

• Bachelor’s degree in Information Technology, Computer Science, or related discipline.
• 8+ years of experience in system administration with strong expertise in Unix/Linux (Solaris, Red Hat, or similar).
• Hands-on experience with SAN storage for Unix/Linux platforms.
• Skilled in OS hardening, patching, and enterprise backup solutions.
• Experience with monitoring and management tools for large-scale environments.
• Proficient in scripting (Shell, Perl, or Python) for automation and system tasks.
• Familiarity with database administration and data center operations (advantageous).
• Ability to provide 24/7 on-call support on a rostered basis and after-hours support for critical changes.
• Strong communication skills with the ability to influence and collaborate across teams and levels.
• Excellent problem-solving, analytical, and troubleshooting skills.
• Proactive, customer-focused, and resilient in fast-paced environments.
• Relevant certifications: Unix/Linux System Administrator (required); Cloud administration certifications (AWS, Azure, or GCP) (preferred).

Interested applicants, please email your updated CV to Angelica DY at [e-mail].

Only shortlisted applicants will be notified.