RHEL & OpenShift Platform Lead

ZENITH INFOTECH (S) PTE LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Zenith Infotech (S) Pte Ltd is seeking a seasoned Linux and OpenShift administrator to own and operate the RHEL OS fleet and OCP clusters in enterprise environments. The role focuses on patching, hardening, and secure operations across dev, SIT, UAT, and PROD environments.

You will configure MCOs, manage certificates, networking, and registry integrations (Quay), and collaborate with security teams on VAPT remediation and policy enforcement.

Qualifications

• Hands-on experience administering RHEL 8/9 in enterprise production environments.
• Experience deploying, upgrading and managing OCP 4.x clusters (bare metal or IaaS).
• Knowledge of security hardening per CIS/DISA benchmarks and SSH/MAC remediation.
• Familiarity with Quay registry, image vulnerability scanning and registry mirroring.

Responsibilities

• Own and maintain the RHEL OS fleet underpinning OCP worker and application servers.
• Plan and execute RHEL OS patching cycles with minimal service disruption.
• Implement OS hardening benchmarks and SELinux/policy configurations.
• Manage OCP cluster lifecycle, MCO configuration, and certificate rotation.
• Administer Quay registry and perform vulnerability remediation for components.

Skills

RHEL System Administration

OpenShift Administration

Enterprise container architecture

Quay registry administration

Tools

Quay Registry

RHEL Satellite

Machine Config Operator

Job description

Zenith Infotech (S) Pte Ltd is seeking a seasoned Linux and OpenShift administrator to own and operate the RHEL OS fleet and OCP clusters in enterprise environments. The role focuses on patching, hardening, and secure operations across dev, SIT, UAT, and PROD environments.

You will configure MCOs, manage certificates, networking, and registry integrations (Quay), and collaborate with security teams on VAPT remediation and policy enforcement.