Senior RHEL & OpenShift Platform Engineer

Rapsys Technologies Pte Ltd.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Rapsys Technologies Pte Ltd. in Singapore is seeking a TA and Platform Engineer specializing in Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP).

The role requires hands-on experience with enterprise-scale platforms and will focus on RHEL OS management and OCP cluster administration. Your responsibilities cover OS patching, security hardening, cluster upgrades, MCO configuration, and troubleshooting across DEV to PROD environments, with emphasis on reliability and

Qualifications

• Hands-on experience administering RHEL 8/9 in production environments.
• Proficiency in OS patching, package management (dnf/yum), SELinux enforcement, and CIS/DISA benchmarks.
• Experience with OCP 4.x clusters: upgrades, MCO, RBAC, networking, and security hardening.

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 (EUS channel management, kernel upgrades, reboot sequencing) with minimal service disruption.
• Implement and validate OS hardening benchmarks — SELinux policies, firewalld rules, auditd configuration, and cryptographic policy settings.
• Troubleshoot system-level issues: kernel parameters, resource limits (ulimits, cgroups), storage mounts (NFS, iSCSI, SMB/CIFS PVs on OCP).
• Manage RHEL subscriptions, entitlements, and satellite/image registries.

Skills

RHEL Admin

OCP Admin

Container Architecture

Tools

Quay Registry

Satellite

Job description

Rapsys Technologies Pte Ltd. in Singapore is seeking a TA and Platform Engineer specializing in Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP).

The role requires hands-on experience with enterprise-scale platforms and will focus on RHEL OS management and OCP cluster administration. Your responsibilities cover OS patching, security hardening, cluster upgrades, MCO configuration, and troubleshooting across DEV to PROD environments, with emphasis on reliability and