Senior L3 Network & Security Engineer: Cisco & Firewalls

NTT SINGAPORE PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Part time

Job summary

NTT Singapore is seeking an experienced L3 Network Security Engineer to manage and secure a large-scale enterprise network. You will work on Cisco infrastructure, firewalls from Palo Alto/Check Point/Fortinet, Infoblox DNS/DHCP/IPAM and F5 load balancers.

The role emphasizes automation using Python and Ansible, RCA for incident resolution, and collaboration with infrastructure and security teams in a high-security environment.

Qualifications

• 7+ years of hands-on Network / Network Security Engineering experience.
• Strong hands-on experience supporting Cisco network infrastructure.
• Experience across Palo Alto, Check Point, Fortinet, Infoblox and F5.
• Strong knowledge of routing, switching, TCP/IP, BGP, OSPF, LAN/WAN and VLAN.
• Hands-on experience with firewalls, network security and security policy management.
• Experience with F5 load balancing and application delivery technologies.
• Experience with Infoblox DNS, DHCP and IPAM.
• Strong network automation experience using Python and Ansible.
• Strong L3 troubleshooting, incident resolution and RCA experience.
• Experience in banking, financial services, or large enterprise environments helpful.

Responsibilities

• Provide L3 network and network security engineering support for complex enterprise infrastructure.
• Manage, configure, troubleshoot and optimise Cisco network infrastructure, including routers and switches.
• Support and troubleshoot network security technologies including Palo Alto, Check Point and Fortinet firewalls.
• Support F5 load balancers and application delivery infrastructure.
• Manage and troubleshoot Infoblox DNS, DHCP and IPAM services.
• Configure and troubleshoot BGP, OSPF, VLANs, STP, ACLs and other Layer 2/Layer 3 technologies.
• Handle complex L3 network/security incidents, perform RCA and drive issues to resolution.
• Develop and enhance network automation using Python and Ansible to improve efficiency.
• Maintain network/security documentation, configurations, diagrams and SOPs.

Skills

L3 Networking

Cisco Networking

Network Automation

Python

Ansible

Root Cause Analysis

Tools

Palo Alto

Check Point

Fortinet

Infoblox

F5

Job description

NTT Singapore is seeking an experienced L3 Network Security Engineer to manage and secure a large-scale enterprise network. You will work on Cisco infrastructure, firewalls from Palo Alto/Check Point/Fortinet, Infoblox DNS/DHCP/IPAM and F5 load balancers.

The role emphasizes automation using Python and Ansible, RCA for incident resolution, and collaboration with infrastructure and security teams in a high-security environment.