UNIX / Linux L3 Engineer

RAPSYS TECHNOLOGIES PTE. LTD.; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

RAPSYS TECHNOLOGIES PTE. LTD. seeks a skilled UNIX/Linux infrastructure engineer to install, configure, and harden servers while building multi-environment stacks.

You will deliver shell and Python automation, apply IaC practices, and ensure high availability and robust storage configurations for production readiness.

Qualifications

• Strong Linux administration skills, including RHEL/Oracle Linux.
• Experience building and hardening UNIX/Linux servers.
• Proficient in Shell scripting and Python for automation.
• Experience with HA and clustering (Veritas Cluster/VCS) and storage (SAN/NAS, LVM).
• Strong troubleshooting and L3 infrastructure support capabilities.

Responsibilities

• Install, configure, and harden UNIX/Linux servers.
• Build and configure Dev, Test, UAT, and Production environments.
• Provide L3 infrastructure support and resolve complex server issues.

Skills

Linux Administration (RHEL/Oracle)

UNIX/Linux server build & hardening

Shell scripting

Python automation

High Availability & Clustering

Storage SAN/NAS & LVM

Troubleshooting & L3 support

Tools

AWS

Azure

VMware

Veritas Cluster

IaC / configuration management

Job description

Key Responsibilities

Infrastructure Build & Implementation

• Install, configure, and harden UNIX/Linux servers .
• Build and configure Development, Test, UAT, and Production environments.
• Configure server storage, networking, security, and system services .

Project & L3 Support

• Provide L3 infrastructure support and resolve complex server issues.
• Collaborate with application, database, network, cloud, and security teams.
• Support infrastructure planning, design reviews, deployments, and cutover activities.
• Ensure infrastructure readiness for application onboarding and releases.

Automation

• Develop Shell and Python scripts for server provisioning and operational automation.
• Implement configuration management and Infrastructure-as-Code (IaC) practices.
• Standardise server builds and deployment procedures.

Security & Compliance

• Implement OS hardening and security best practices .
• Perform patching and vulnerability remediation.
• Ensure compliance with organisational and regulatory security standards.

Documentation

• Create and maintain Technical Design Documents (TDDs), SOPs, build documents, runbooks, and knowledge articles .
• Provide knowledge transfer to operations and support teams.

Must-Have Skills

• Strong Linux Administration , particularly RHEL / Oracle Linux .
• Strong experience in UNIX/Linux server build, configuration, and security hardening .
• Strong Shell Scripting and Python automation skills.
• Experience with High Availability and Clustering , preferably Veritas Cluster / VCS FSS .
• Experience with Storage: SAN/NAS and LVM .
• Strong troubleshooting and L3 support experience.

Good to Have

• Experience with AWS, Azure, and VMware .
• Infrastructure-as-Code and configuration management experience.
• IBM MQ experience.
• Disaster Recovery and capacity/performance management experience.