TA and Platform Engineer (RHEL & OCP Specialist)

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.