RHEL & OpenShift Platform Engineer

AVENSYS CONSULTING PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

AVENSYS CONSULTING PTE. LTD. is hiring a TA and Platform Engineer (RHEL & OCP Specialist) in Singapore. The role focuses on RHEL platform management and OpenShift cluster administration to support enterprise workloads.

Responsibilities include patch management, OS hardening, and integrating application platforms while ensuring secure, scalable infrastructure across DEV, SIT, UAT, and PROD environments.

Qualifications

• Hands-on experience administering RHEL 8/9 in enterprise environments.
• Experience with RHEL EUS lifecycle management and upgrades.
• Experience deploying and managing OpenShift Container Platform 4.x clusters.
• Knowledge of RHEL subscription management and satellite/image registries.

Responsibilities

• Own and manage RHEL OS fleet underpinning OCP nodes and app servers.
• Plan and execute RHEL patch cycles with minimal disruption.
• Implement OS hardening: SELinux, firewalld, auditd, crypto policies.
• Manage OCP clusters, MCO configurations, and node lifecycle.
• Administer Quay mirror registry and image security scanning.
• Support container provisioning and deployment across DEV/SIT/UAT/PROD.

Skills

RHEL platform management

OCP administration

OS hardening

Troubleshooting

CI/CD/DevSecOps

Tools

RHEL 8/9

EUS lifecycle

Satellite

Quay registry

MCO (Machine Config Operator)

HAProxy

RBAC/SCC

OCP 4.x

Job description

Avensys is a reputed global IT professional services company headquartered in Singapore. Our service spectrum includes enterprise solution consulting, business intelligence, business process automation, and managed services. Given our decade of success, we have evolved to become one of the top trusted providers in Singapore and service a client base across banking and financial services, insurance, information technology, healthcare, retail, and supply chain.

We are currently looking to hire an TA and Platform Engineer (RHEL & OCP Specialist). This is an exciting opportunity to expand your skill set, achieve job satisfaction, and enjoy a healthy work-life balance. More details are below.

JOB TYPE

12 Months Contract

ROLES 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

REQUIREMENTS

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

WHAT'S ON OFFER

You will be remunerated with an excellent salary and be entitled to attractive company benefits. Additionally, you will have the opportunity to work in a fun and collaborative environment with excellent career growth prospects.