Senior Linux & OpenShift Infrastructure Engineer (L2/L3)

SAGL Consulting; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

SAGL Consulting is seeking an experienced Infrastructure Engineer in Singapore to provide L2/L3 support and administration for Linux, Red Hat OpenShift, and enterprise infrastructure environments. You will manage production systems, troubleshoot complex issues, ensure platform availability, and drive automation initiatives.

The role requires hands-on RHEL and OpenShift expertise, plus experience with AWS, ELK, scripting, and ITIL-based processes.

Qualifications

• Hands-on Linux system administration with RHEL.
• Mandatory hands-on OpenShift administration including cluster management, deployment, monitoring, upgrades and troubleshooting.
• Experience supporting Linux/OpenShift platforms in production managed-services environments.
• Scripting and automation using Ansible, Bash, Python or PowerShell.
• Knowledge of AWS, Nutanix, Apache web servers and ELK Stack.
• Familiarity with ITIL-based incident, problem, change and service requests management.
• Experience with ServiceNow or other ITSM ticketing platforms.
• Bachelor's degree in IT, Computer Science or equivalent.

Responsibilities

• Administer and troubleshoot RHEL servers (installation, configuration, patching, security hardening).
• Manage and support OpenShift Container Platform, including cluster operations, deployments, upgrades and monitoring.
• Investigate and resolve L2/L3 infrastructure incidents within SLAs.
• Perform system performance monitoring and root-cause analysis.
• Support AWS, Nutanix environments and Apache web servers.
• Coordinate infrastructure changes and patching per change management.
• Monitor infrastructure with ELK Stack and other tools.
• Develop automation scripts using Ansible, Bash, Python or PowerShell.
• Support API integrations, JSON and CI/CD workflows.
• Troubleshoot issues involving F5 load balancers, SNMP, and related tech.
• Maintain technical documentation and runbooks.
• Collaborate with internal teams, vendors, and service providers.
• Identify recurring incidents and opportunities for automation to improve reliability.
• Support disaster recovery testing and exercises.

Skills

Linux administration

OpenShift administration

Scripting & automation

Production support

Monitoring & incident response

Education

Bachelor's degree in IT or Computer Science

Tools

RHEL

OpenShift

ELK Stack

Ansible

Bash

Python

PowerShell

AWS

Nutanix

Apache

F5

ITSM (ServiceNow)

Job description

Job Description

We are seeking an experienced Infrastructure Engineer to provide L2/L3 technical support and administration across Linux, Red Hat OpenShift and enterprise infrastructure environments. The role involves managing production infrastructure, troubleshooting complex technical issues, maintaining platform availability and supporting infrastructure automation.

Key Responsibilities

• Administer and troubleshoot Red Hat Enterprise Linux (RHEL) servers, including installation, configuration, patching and security hardening.

• Manage and support Red Hat OpenShift Container Platform (OCP), including cluster operations, application deployments, upgrades and platform monitoring.

• Investigate and resolve L2/L3 infrastructure incidents and service requests within agreed SLAs.

• Perform system performance monitoring, capacity analysis and root cause analysis.

• Support AWS infrastructure, Nutanix environments and Apache web servers.

• Manage infrastructure changes, maintenance activities and patching in accordance with change management procedures.

• Monitor infrastructure using ELK Stack (Elasticsearch, Logstash and Kibana) and other monitoring tools.

• Develop scripts and automation using Ansible, Bash, Python or PowerShell.

• Support infrastructure integrations through APIs, JSON and CI/CD workflows.

• Troubleshoot infrastructure issues involving F5 load balancers, SNMP and related technologies.

• Maintain technical documentation, operational procedures and knowledge articles.

• Coordinate with internal technical teams, vendors and third-party service providers.

• Identify recurring incidents and automation opportunities to improve infrastructure reliability and operational efficiency.

• Support disaster recovery activities and testing where required.

Requirements

• Hands-on experience in Linux system administration, particularly Red Hat Enterprise Linux (RHEL).

• Mandatory hands-on experience in Red Hat OpenShift Container Platform administration, including cluster management, deployment, monitoring, upgrades and troubleshooting.

• Experience supporting Linux and OpenShift platforms in production managed-services environments.

• Strong knowledge of Linux installation, configuration, patching, security hardening and performance troubleshooting.

• Familiarity with AWS administration, Nutanix, Apache web servers and BigFix.

• Working knowledge of infrastructure monitoring and ELK Stack.

• Experience with scripting and automation using Ansible, Bash, Python or PowerShell.

• Knowledge of Windows infrastructure technologies, including Active Directory Domain Services and SQL Server.

• Familiarity with F5 load balancers, SNMP, APIs, JSON and CI/CD processes.

• Experience with ITIL-based incident, problem, change and service request management.

• Working knowledge of ServiceNow or other ITSM ticketing platforms.

• Bachelor's degree in IT, Computer Science or equivalent qualification.

Mandatory Certifications

• Red Hat certification relevant to Linux System Administration.

• Red Hat OpenShift Container Platform (OCP) certification relevant to OpenShift Administration.

#Openshift