TA and Platform Engineer (RHEL & OCP Specialist)

KRIS INFOTECH PTE. LTD.; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

KRIS INFOTECH PTE. LTD. seeks an experienced RHEL/OCP Administrator to manage enterprise OpenShift environments and secure OS configurations. You will patch, harden, and tune OS and cluster settings while coordinating with development teams to maintain production reliability.

The role emphasizes hands-on RHEL 8/9 administration, EUS lifecycle management, OCP 4.x operations, and security hardening across CI/CD pipelines and infrastructure tooling.

Qualifications

• Minimum 3 years TA / infra / cloud working experience.
• Hands-on experience administering RHEL 8/9 in enterprise production environments.
• Proficiency in OS patching, package management (dnf/yum), SELinux, CIS/DISA benchmarks.
• Experience with RHEL EUS lifecycle management and image deployments (RHEL Image Mode / Bootc).
• Hands-on experience deploying, configuring, and administering OCP 4.x clusters (bare metal or IaaS).
• Familiar with OCP security hardening: SSH cipher/MAC remediation, SCC policies, network policies, and image scanning.

Responsibilities

• Own and maintain the RHEL OS fleet underpinning OCP worker/control-plane nodes and non-containerised servers.
• Plan and execute RHEL OS patching cycles with minimal service disruption.
• Implement and validate OS hardening benchmarks and firewall/audit configurations.
• Troubleshoot system-level issues: kernel parameters, cgroups, storage mounts.
• Manage OCP clusters, MCO, certificates, and RBAC across namespaces.
• Support JVM and container resource tuning for Java workloads on OCP.

Skills

RHEL System Administration

OpenShift Administration

Cloud/Infra Experience

Security hardening

Tools

Quay registry

RHEL Satellite

Job description

Job Description:

RHEL Platform Management (Primary Focus):

• 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.
• Apply government-grade security hardening principles (IM8 compliance, SSCT framework, CIS benchmarks) across RHEL and OCP layers.
• Contribute to DevSecOps tooling and automation concepts — CI/CD pipelines, IaC, and operational runbooks.
• Support AWS administration tasks where applicable (CloudWatch monitoring, IAM, S3, hybrid integration).

Requirements:

• Minimum 3 years TA / infra / cloud working experience.

RHEL System Administration (Required — Primary Differentiator):

• Hands‑on experience administering RHEL 8/9 in enterprise production environments.
• 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).

OpenShift Container Platform (OCP) Administration (Required — Primary Differentiator):

• 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.
• Experience with OCP networking (Routes, Ingress, HAProxy), storage (PV/PVC, storage classes), and role-based access control (RBAC).
• Familiar with OCP security hardening: SSH cipher/MAC remediation via MCO, SCC policies, network policies, and image vulnerability scanning (Quay/Clair).
• Experience with Quay registry administration including mirror registry setup for air‑gapped or restricted environments.

Enterprise Container Architecture & Integration Platforms:

• 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.
• Familiar with microservices architecture, API gateway integration, and container image lifecycle management.