Senior RHEL & OpenShift Platform Engineer

ARISTON SERVICES PTE. LTD.; Singapore; On-site; SGD 100,000 - 140,000; Full time

Job summary

ARISTON SERVICES PTE. LTD. is seeking a senior RHEL/OCP platform administrator in Singapore to own and operate enterprise Linux and OpenShift environments. You will manage OS patching, hardening, and subscription lifecycle while running OCP clusters, machine-config-driven node customization, and secure container workflows.

You will collaborate with build teams on integration points, support multi-environment deployments, and contribute to DevSecOps practices with CI/CD and IaC processes.

Qualifications

• Hands-on experience administering RHEL 8/9 in enterprise production environments.
• Proficiency in OS patching, package management (dnf/yum), SELinux enforcement, and CIS/DISA benchmarks.
• Experience with RHEL EUS lifecycle management and version upgrades.
• Familiarity with RHEL subscription management, satellite server, and image-based deployments.

Responsibilities

• Own and maintain the RHEL OS fleet underpinning OCP worker/control-plane nodes and non-containerised application servers.
• Plan and execute RHEL OS patching cycles with minimal service disruption.
• Implement and validate OS hardening benchmarks — SELinux policies, firewalld rules, auditd configuration, and cryptographic policy settings.
• Troubleshoot system-level issues and manage subscriptions, entitlements, and image registries.
• Deploy, upgrade, and maintain OCP 4.x clusters including control plane and etcd health.
• Configure MCO for node OS customization and perform certificate rotation.
• Manage OCP networking, ingress, and HAProxy tuning for enterprise workloads.
• Administer Quay mirror registry and coordinate vulnerability remediation.
• Apply RBAC, SCCs, policies, and quotas across namespaces; support JVM/container tuning.

Skills

RHEL Administration

OS Patching

SELinux & CIS Hardening

OCP Administration

RBAC & Networking (OCP)

Tools

Quay Registry

RHEL Satellite

Job description

ARISTON SERVICES PTE. LTD. is seeking a senior RHEL/OCP platform administrator in Singapore to own and operate enterprise Linux and OpenShift environments. You will manage OS patching, hardening, and subscription lifecycle while running OCP clusters, machine-config-driven node customization, and secure container workflows.

You will collaborate with build teams on integration points, support multi-environment deployments, and contribute to DevSecOps practices with CI/CD and IaC processes.