TA and Platform Engineer (RHEL & OCP Specialist) (Ref 26005)

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)

Requirements • Degree in Computer Science, Information Technology, Systems Engineering, or equivalent practical experience. • At least 3-4 years of relevant working experiences 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

Shortlisted candidates will be offered a 1 Year agency contract employment.