Senior Unix / Linux System Administrator

Job description

​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.

Key Responsibilities

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 AngelicaD@charterhouse.com.sg.

Only shortlisted applicants will be notified.