OT Network Engineer: Secure, Segmented Industrial Networks

SECURA SINGAPORE PTE. LTD.; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

SECURA SINGAPORE PTE. LTD. is seeking an experienced Network Engineer to design, implement, maintain, and secure network infrastructure for an OT/industrial environment.

The role focuses on a segmented, air-gapped network to ensure reliable and secure communication among industrial systems and supporting IT. You will manage site-to-site VPNs, DMZ services, Microsoft Entra ID (Azure AD), and firewall configurations while upholding cybersecurity and change-management practices in a critical

Qualifications

• 3+ years of experience in network engineering in OT/industrial environments.
• Strong knowledge of TCP/IP, VLANs, routing, DNS, DHCP, and troubleshooting.
• Experience with enterprise firewalls and site-to-site VPNs.
• Proficient in network segmentation and DMZ architecture.
• Familiar with Microsoft Entra ID / Azure AD and Windows servers.
• Understanding of cybersecurity for OT and secure network design.

Responsibilities

• Configure, maintain, and troubleshoot network infrastructure within an air-gapped OT environment.
• Manage switches, routers, firewalls, VLANs, routing, and segmentation.
• Implement secure segmentation between OT, IT, DMZ and other zones.
• Maintain network diagrams, IP schemes, documentation, and inventories.
• Perform changes with minimal disruption to critical operations.
• Configure and troubleshoot site-to-site VPN connections.
• Manage a DMZ hosting services used by clients to upload files.
• Support network authentication with Microsoft Entra ID/Azure AD.
• Assist with OT device connectivity and network access issues.

Skills

3+ years of experience in network工程

TCP/IP

VLANs

Subnetting

Routing

DNS

DHCP

Network troubleshooting

Enterprise firewalls

Site-to-site VPNs

Network segmentation

DMZ architecture

Microsoft Entra ID / Azure AD

Windows-based servers

Network monitoring tools

Cybersecurity principles

Job description

SECURA SINGAPORE PTE. LTD. is seeking an experienced Network Engineer to design, implement, maintain, and secure network infrastructure for an OT/industrial environment.

The role focuses on a segmented, air-gapped network to ensure reliable and secure communication among industrial systems and supporting IT. You will manage site-to-site VPNs, DMZ services, Microsoft Entra ID (Azure AD), and firewall configurations while upholding cybersecurity and change-management practices in a critical