TA and Platform Engineer

Kris Infotech : Technology & Talent - Synced; Singapore; On-site; SGD 140,000 - 190,000; Full time

Job summary

Kris Infotech : Technology & Talent - Synced in Singapore is seeking an experienced Linux/OCP administrator to own the RHEL OS fleet underpinning OpenShift worker and control-plane nodes, plus non-containerised apps.

You will plan and execute RHEL patching cycles, implement OS hardening (SELinux, firewalld, auditd), manage subscriptions, and tune resources for Java workloads across DEV to PROD. The role requires 3+ years in TA/infra or cloud, RHEL 8/9, OCP 4.x, CIS/DISA benchmarks.

Qualifications

• Hands-on experience administering RHEL 8/9 in enterprise environments.
• Familiarity with CIS/DISA benchmarks for system hardening.
• Experience with OpenShift 4.x operations and RBAC/SCCs.

Responsibilities

• Own and maintain the RHEL OS fleet for OCP worker/control-plane nodes and app servers.
• Plan patching cycles, upgrade kernels, and minimize downtime.
• Configure MCO, RBAC, network policies, and certificate rotation.
• Triage kernel, storage, and resource issues affecting performance.

Skills

RHEL administration

OpenShift / OCP

OS patching

SELinux hardening

Kubernetes RBAC

JVM/containers tuning

Storage (NFS/iSCSI)

Networking basics

Scripting/automation

Troubleshooting

Education

Bachelor's in Computer Science / IT

Tools

Satellite management

Quay registry

Job description

• 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 (Primary Focus)

• 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