RHEL Systems Engineer | VMware & On-Call Expert

Combuilder Pte Ltd; Singapore; On-site; SGD 50,000 - 80,000; Full time

Job summary

Combuilder Pte Ltd in Singapore is seeking an experienced Infrastructure Administrator to manage and support enterprise-class servers and virtualization environments. You will install, patch, and harden systems, monitor performance, and collaborate with project teams to drive infrastructure initiatives.

The role covers AD DNS DHCP GP management, storage, backups, and a monthly on‑call roster for a 24/7 environment.

Qualifications

• Diploma or degree in Computer Science, Information Technology or a related discipline.
• Minimum 4-5 years of experience in infrastructure support or systems administration.
• Hands-on experience with Red Hat Enterprise Linux (RHEL) and VMware vSphere/ESXi.
• Experience with Windows Server, Active Directory, DNS, DHCP and Group Policy.
• Knowledge of security hardening, system monitoring, troubleshooting, storage, backup and recovery.
• Good communication and problem-solving skills, with the ability to work independently and in a team.
• Willingness to provide scheduled standby and on-call support.
• VMware NSX or MongoDB experience is an advantage.

Responsibilities

• Administer and maintain Red Hat Enterprise Linux (RHEL), Windows servers and VMware vSphere/ESXi environments.
• Perform system installation, configuration, patching, upgrades and security hardening.
• Monitor system health and performance, analyse logs, troubleshoot incidents and conduct root cause analysis.
• Plan and support infrastructure migrations, upgrades and capacity requirements.
• Manage SAN/NAS storage, backups and recovery to meet operational requirements.
• Administer Active Directory, DNS, DHCP, Group Policy and related services.
• Ensure compliance with cybersecurity requirements and maintain system documentation and change records.
• Work with technical and project teams to support daily operations and infrastructure initiatives.
• Participate in a monthly on-call roster supporting a 24/7 environment.

Skills

RHEL

VMware vSphere/ESXi

Windows Server

Active Directory

Security hardening

Education

Diploma or degree in Computer Science/Information Technology

Job description

Combuilder Pte Ltd in Singapore is seeking an experienced Infrastructure Administrator to manage and support enterprise-class servers and virtualization environments. You will install, patch, and harden systems, monitor performance, and collaborate with project teams to drive infrastructure initiatives.

The role covers AD DNS DHCP GP management, storage, backups, and a monthly on‑call roster for a 24/7 environment.