Linux Engineer

QUESS SELECTION & SERVICES PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

QUESS SELECTION & SERVICES PTE. LTD. seeks a senior Linux systems administrator with extensive experience in RHEL, clustering, and GPFS to ensure secure, high‑performing on‑prem infrastructure.

You will design, implement, and maintain Linux clusters, perform capacity planning, and drive automation using Ansible across compute, storage, and network domains. With a focus on HA, security hardening, and ongoing optimization, you’ll collaborate with application, middleware, and storage teams to

Qualifications

• 6+ years of Unix administration in on-premises environments.
• Strong Linux administration knowledge and experience.
• Excellent communication and stakeholder management skills.
• Background in High Availability and virtualization technologies.
• Familiarity with ITSM/ITIL frameworks is a plus.
• Proven ability to improve performance measurement and reporting in a large org.
• Experience collaborating with multi-disciplinary teams with delivery focus.

Responsibilities

• Demonstrate strong expertise in RHEL system administration, including installation, configuration, hardening, and lifecycle management of Linux servers for security, performance, and high availability.
• Design, implement, and manage Linux clustering solutions (Pacemaker) and GPFS SpectrumScale for HA, scalability, and performance in on‑prem environments.
• Monitor, troubleshoot, and optimize Linux infrastructure covering compute, storage (GPFS), networking, and security components.
• Develop and maintain Ansible-based configuration management for provisioning, configuration, patching, and standard tasks.
• Create, maintain automation playbooks and scripts with Ansible to streamline deployments and cluster operations.
• Collaborate with application, middleware, and storage teams to ensure GPFS storage integrates with business apps.
• Ensure Linux systems and clustering environments comply with internal security policies and industry standards.
• Plan and execute scheduled maintenance, patching, upgrades, and hardening activities.
• Provide day-to-day Linux admin and operations support, including 24x7 standby/on‑call rotation.
• Maintain up-to-date system, cluster, and configuration documentation.

Skills

Unix administrator

Linux

High Availability

Virtualization

ITIL

Tools

GPFS

Pacemaker

Ansible

VMware

Job description

Key Responsibilities

• Demonstrate strong expertise inRHEL system administration, including installation, configuration, hardening,and lifecycle management of Linux servers to ensure security, performance, andhigh availability.
• Design, implement, and manageLinux clustering solutions, including Pacemaker clusters and IBM GPFS (SpectrumScale) for high availability, scalability, and performance in on‑premises environments.
• Monitor, troubleshoot, andoptimize Linux infrastructure, covering compute, storage (including GPFS),networking, and security components.
• Leverage operational experienceto design and implement infrastructure improvements that enhance systemsecurity, stability, performance, and operational efficiency.
• Develop, maintain, andcontinuously improve configuration management solutions using Ansible toautomate provisioning, configuration, patching, and standard operational tasks.
• Design, implement, and maintainautomation playbooks and scripts using Ansible to streamline repetitive tasks,deployments, cluster operations, and configuration management.
• Work closely with application,middleware, and storage teams to ensure seamless integration of Linux systemsand GPFS storage with business applications and services.
• Ensure Linux systems andclustering environments comply with internal security policies, industrystandards, and regulatory requirements.
• Proactively monitor system andcluster performance and conduct capacity planning to anticipate resource needsand ensure optimal performance.
• Troubleshoot complex system,cluster, and storage incidents, manage escalations, and coordinate with vendors(including Red Hat and IBM) for advanced support as required.
• Plan and execute scheduledpreventive maintenance, including OS patching, upgrades, cluster maintenance,and system hardening activities.
• Perform system and performancetuning, optimization, and capacity planning across standalone and clusteredLinux environments.
• Fulfil service requests andchange requests in line with established ITSM andchange management processes.
• Manage and support VMwarevirtualized environments hosting Linux workloads.
• Collaborate with cross‑functional teams and external vendors to support operational activitiesand project deliverables.
• Provide day‑to‑day Linux system administrationand operations support, including participation in 24x7 standby/on‑call rotation.
• Provide technical input, designreviews, and advisory support for infrastructure and application projects.
• Maintain accurate and up‑to‑date system, cluster, and configuration documentation.

Required Experience & Skills

• 6+ years of relevant workingexperience as a Unix administrator in on premise setup.
• Strong technical knowledge andexperience in administration and maintenance of Linux.
• Excellent communication andstakeholder management skills.
• Strong background in Unix technologies including High Availability and virtualization.
• Storage admin/SAN technology fromsystem perspective.
• Familiarity with ITSM, ITIL, orother relevant frameworks is a plus.
• Proven ability to identify andimprove performance measurement and reporting processes in a largeorganization.
• Experience of workingcollaboratively with multi-disciplinary teams with a delivery focus in bothproject and operational environments
• Excellent spoken and writtenBusiness English skills and the ability to write clear and concise text fordifferent audiences.
• Ability to handle confidentialinformation with tact and sensitivity.
• A flexible approach to adapt to changingdeadlines.