Systems Administrator (Unix)

CHARTERHOUSE PTE. LTD.; Singapore; On-site; SGD 70,000 - 90,000; Full time

Job summary

A technology services company in Singapore is looking for a Systems Engineer with extensive experience in Unix/Linux administration. The ideal candidate will handle OS environments, manage upgrades, and ensure security compliance. A Bachelor's degree and certifications in Unix/Linux, alongside a readiness for 24/7 support rotation, are required. This role offers an opportunity to impact infrastructure management and operational excellence.

Qualifications

• 8+ years of experience in Unix/Linux system administration in high-security environments.
• Practical expertise in managing SAN-connected systems.
• Experience in OS patching and compliance alignment.

Responsibilities

• Administer and maintain heterogeneous OS environments.
• Track server utilization metrics and forecast capacity needs.
• Manage deployment windows for patching and upgrades.

Skills

Unix/Linux system administration

Shell scripting

Vulnerability mitigation

Database support

Team collaboration

Education

Bachelor's degree in Computer Science or related discipline

Certifications in Unix/Linux (e.g., RHCSA, RHCE)

Cloud administration certifications (AWS, Azure)

Job description

Key Responsibilities

Platform & Systems Engineering

• Administer and maintain heterogeneous OS environments including Solaris and Linux across production and non-production zones.
• Plan and execute upgrades, patches, and platform enhancements across infrastructure components.
• Enforce security baselines, OS-level hardening, and deploy vendor/OS-specific vulnerability fixes.
• Track end-of-life status of platform components and proactively manage refresh cycles.
• Oversee renewal schedules for expiring credentials, passwords, and server-side certificates.
• Implement and maintain backup policies, system snapshots, and database archival processes to support data protection and recovery.
• Design and test DR strategies for server infrastructure; conduct routine failover and recovery simulations to validate readiness.
• Coordinate UAT activities for application teams and maintain integrity of the UAT environments.
• Maintain infrastructure documentation including architecture diagrams, admin manuals, and recovery procedures.
• Provide deep-dive (L3) technical troubleshooting support for complex platform issues and escalations.

Incident & Root Cause Handling

• Deliver Tier 2 response and resolution for OS-related issues within agreed SLA timelines.
• Perform in-depth analysis of recurring faults and design countermeasures to improve resilience.

Change & Release Operations

• Manage deployment windows for patching and upgrades under the established change governance framework.
• Build and package deployment artefacts using internal automation tools or scripts.

Asset & Configuration Governance

• Maintain a centralised repository of infrastructure assets and configuration profiles for servers and middleware.
• Ensure audit readiness of system configurations and change logs.

Capacity & Performance Tuning

• Track server utilisation metrics and forecast capacity needs in line with expected load trends.
• Conduct performance diagnostics and fine-tune system parameters to meet platform SLAs.

Process Development & Compliance

• Create and refine IT operations workflows aligned to corporate governance, audit, and security standards.

Project Support & Delivery

• Contribute to project rollouts by provisioning, configuring, and validating system infrastructure.
• Lead infrastructure enhancement workstreams in accordance with organisational best practices.

Knowledge Management

• Maintain system documentation, runbooks, operational standards, and configuration histories for continuity.

Requirements

• A Bachelor's degree in Computer Science, Information Technology, or related discipline.
• At least 8 years of experience in Unix/Linux system administration, preferably in high-security or regulated environments.
• Practical expertise in managing SAN-connected systems and integrating storage into Unix/Linux workflows.
• Solid experience with OS patching, vulnerability mitigation, and compliance alignment.
• Familiarity with enterprise-class backup, monitoring, and system health solutions.
• Comfortable with shell scripting and automation in Unix/Linux environments.
• Understanding of database support and data center operating procedures is advantageous.
• Willingness to participate in a 24/7 rotational support roster and respond to after-hours change events.
• Proven ability to communicate complex issues clearly across business and technical teams.
• Team player with a hands-on mindset, high ownership, and a problem-solving attitude.
• Able to handle multiple priorities and operate effectively under pressure.
• Certifications in Unix/Linux system administration (e.g., RHCSA, RHCE, Solaris Admin) required.
• Cloud administration certifications (AWS, Azure, or similar) are highly desirable.

Reg. No. R1878306

EA License no.: 16S8066