TA and Platform Engineer (RHEL & OCP Specialist)

Main Role and Responsibilities

• 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)

Top 3 Must-Have Skills

• 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 Minimum 3 years TA / infra / cloud working experience