Senior Linux & OpenShift Infrastructure Engineer (L2/L3)

sagl consulting pte. ltd.; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

SAGL CONSULTING PTE. LTD. seeks an experienced Infrastructure Engineer to deliver L2/L3 support across Linux, Red Hat OpenShift, and enterprise infrastructure. You will manage production environments, troubleshoot complex issues, and support automation initiatives.

Role covers platform availability, incident resolution, and collaboration with internal teams and vendors. Strong experience with RHEL, OpenShift, AWS, and scripting is required, with emphasis on security hardening and change control.

Qualifications

• Hands-on Linux system administration (RHEL)
• Mandatory OCP/OpenShift Administration experience
• Production support for Linux/OpenShift environments
• Strong Linux installation, patching, security hardening, performance
• Familiarity with AWS, Nutanix, Apache and BigFix
• Experience with infrastructure monitoring (ELK)
• Scripting/automation with Ansible, Bash, Python or PowerShell
• Knowledge of Windows AD and SQL Server
• Familiarity with APIs, JSON and CI/CD
• Experience with ITIL incident/problem/change/service requests
• Experience with ServiceNow or similar ITSM
• Bachelor level IT/CS or equivalent

Responsibilities

• Administer and troubleshoot RHEL servers including patching and security hardening.
• Manage OpenShift cluster operations, deployments, upgrades and monitoring.
• Investigate L2/L3 incidents and outages within SLAs.
• Monitor performance, capacity and root cause analyses.
• Support AWS, Nutanix and Apache web servers in production.
• Coordinate changes, maintenance and patching per change control.
• Monitor infrastructure with ELK Stack and other tools.
• Develop automation scripts using Ansible, Bash, Python or PowerShell.
• Integrate infra via APIs/JSON and CI/CD workflows.
• Troubleshoot F5 load balancers, SNMP and related tech.
• Maintain documentation and runbooks; coordinate with vendors.
• Identify recurring incidents and automation opportunities.

Skills

RHEL administration

OpenShift admin

AWS administration

ELK monitoring

Ansible

Bash

Python

PowerShell

CI/CD

APIs/JSON

F5 load balancers

ITIL processes

ServiceNow

Windows AD

SQL Server

Education

Bachelor's degree in IT

Tools

OpenShift

Nutanix

Apache Web Server

ELK Stack

BigFix

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