Singapore, Singapore
Salary not specified
Posted
Full-time
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Job Description

What You'll Do: RHEL Platform Management - 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 OCP Cluster Administration - Deploy, upgrade, and maintain OCP 4.x clusters — including control plane, etcd health, and worker node lifecycle - Configure and manage OCP Machine Config Operator (MCO) for node-level OS customisation: chrony NTP, SSH hardening, kernel arguments, and custom MachineConfigs - Manage cluster certificates, ingress/route configurations, HAProxy timeout tuning for long-running enterprise workloads (e.g., Pega BIX, batch jobs) - Administer Quay mirror registry — image mirroring, vulnerability scanning results, VAPT remediation for bundled components (e.g., jQuery CVEs) - Implement OCP RBAC, SCCs, network policies, and resource quotas across multiple namespaces and project environments - Support JVM and container resource tuning for Java workloads on OCP (heap sizing, Metaspace limits, G1GC flags, container memory budgeting) Application Platform & Integration Support - Take ownership of one or more application platforms (e.g., Pega Infinity, WebSphere, IBM MQ) — covering setup in HA mode, application patching, and ongoing operational support - Participate in architecture sessions with build teams, advising on integration points (web services, MQ, SFTP, API gateway) - Support container provisioning, image lifecycle, and deployment of containerised services across DEV / SIT / UAT / PROD environments Operational Governance & Security - Define and execute operational processes: OS patching, application-level patching, performance monitoring, housekeeping, backup and recovery - Support VAPT engagements — assess Nessus/vulnerability findings, coordinate remediation, and produce risk acceptance or remediation reports What We're Looking For - Degree in Computer Science, Information Technology, Information Systems, or a related discipline - Hands-on experience administering RHEL 8/9 in enterprise production environments - With minimum 3 years in TA / infra / cloud working experience - Proficiency in OS-level patching, package management (dnf/yum), SELinux enforcement, and system hardening per CIS/DISA benchmarks - Experience with RHEL Extended Update Support (EUS) lifecycle management and version upgrades - Familiarity with RHEL subscription management, satellite server, and image-based deployments (RHEL Image Mode / Bootc) - Hands-on experience deploying, configuring, and administering OCP 4.x clusters (bare metal or IaaS) - Proficiency with OCP Day-2 operations: node management, Machine Config Operator (MCO), cluster upgrades, certificate rotation, and resource quota management - Designing and operating multi-tier containerised architectures on OCP/Kubernetes - Working knowledge of IBM MQ messaging — queue manager setup, channel administration, troubleshooting, and HA configuration

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