Senior Unix/Linux System Administrator

3 days ago

Singapore CHARTERHOUSE PTE. LTD. Full time
Roles & Responsibilities

We are seeking an experienced Senior Unix/Linux System Administrator to join our 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)
Tell employers what skills you have

Perl
Azure
Business Continuity
Change Management
Shell Scripting
SAN
Scripting
Unix
Administration
Tuning
Problem Management
RedHat
Operating Systems
System Administration
Performance Tuning
Disaster Recovery
Solaris
Linux

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