Senior Network & Firewall Engineer

CORNERSTONE GLOBAL PARTNERS PTE. LTD.; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

CORNERSTONE GLOBAL PARTNERS PTE. LTD. seeks a Network/Firewall Engineer to manage network and firewall administration, patching, firmware upgrades and vulnerability remediation in Singapore. You will support infrastructure operations, monitor security posture and ensure compliance with SLAs.

The role covers Cisco, Fortinet, F5 platforms, patch management, patch testing, and routine maintenance. Weekend roster and on-call support may be required as part of the schedule.

Qualifications

• 8+ years of experience in network and firewall administration.
• Experience with patch and vulnerability management and troubleshooting patch/firmware issues.
• Experience with Cisco, Fortinet, F5 and related network infrastructure technologies.
• Knowledge of Cisco ACI, Arista, Check Point and Palo Alto Networks where applicable.
• VMware ESXi patching, BIOS/firmware upgrades and patch management tools.

Responsibilities

• Administer and maintain network and firewall environments (Cisco, Fortinet, F5).
• Perform patch management and vulnerability remediation for network and firewall devices.
• Troubleshoot patching, firmware upgrades and infrastructure maintenance issues.
• Plan and coordinate patch deployment activities.
• Perform VMware ESXi patching and BIOS/firmware upgrades.
• Use patch management tools (e.g., NetBot) to deploy and monitor patches.
• Automate pre- and post-patching tasks where applicable.
• Manage Cisco IOS and IOS-XE platforms.
• Analyze network flows and troubleshoot connectivity issues.
• Administer DNS, DHCP and IPAM.
• Maintain VLANs, LAGs, Ethernet, STP, BGP/OSPF/EIGRP routing.
• Configure and maintain standard and extended ACLs.
• Monitor logs and perform routine maintenance for availability and security.

Skills

Network admin

Firewall admin

Patch management

Vulnerability management

Troubleshooting

Cisco IOS

Fortinet

F5

VMware ESXi

DNS/DHCP/IPAM

ACLs

BGP/OSPF/EIGRP

STP

VLANs

Network security

Tools

NetBot

Job description

CORNERSTONE GLOBAL PARTNERS PTE. LTD. seeks a Network/Firewall Engineer to manage network and firewall administration, patching, firmware upgrades and vulnerability remediation in Singapore. You will support infrastructure operations, monitor security posture and ensure compliance with SLAs.

The role covers Cisco, Fortinet, F5 platforms, patch management, patch testing, and routine maintenance. Weekend roster and on-call support may be required as part of the schedule.