Senior Network Security Engineer – Perimeter & IDS Specialist

NTT SINGAPORE PTE. LTD.; Singapore; On-site; SGD 140,000 - 180,000; Full time

Job summary

NTT Singapore Pte. Ltd. is seeking an experienced Network Operations professional to support perimeter security technologies in a banking/finance environment.

You will manage triage, incident handling, and escalation for network infrastructure incidents, with a focus on firewall and IDS/IPS, DNS/DHCP/IPAM and PKI related tasks. The role requires hands-on expertise across CheckPoint NGFW, Fortinet, Palo Alto, Cisco Firepower, and Juniper SRX, plus strong communication skills to brief stakeholders

Qualifications

• 8+ years’ experience in Network Operations support in the banking and finance industry.
• Extensive experience configuring and troubleshooting perimeter security technologies: CheckPoint NGFW (R80+), Fortinet FortiGate, Palo Alto NGFW, Cisco Firepower, Juniper SRX.
• Strong understanding of DMZ and Internet security and multi-vendor network security technologies.
• Proficient with Load Balancer (F5 LTM/GTM), DNS/DHCP/IPAM/NTP (Bluecat), AAA (Clearpass, ISE), Proxy/DLP.
• Solid knowledge of VLAN, TCP/IP, UDP, routing and switching protocols, PKI and certificate handling.
• Experience with packet capture tools (Wireshark, tcpdump) and security tooling (Splunk, SevOne).
• Excellent incident handling, client interfacing, and clear communication under outages.
• Ability to work in fast-paced, high-demand environments and escalate when needed.

Responsibilities

• Provide operational support for network perimeter security technologies.
• Lead production triage for network incidents and coordinate with senior teams.
• Identify service impacts from monitors, dashboards and logs; communicate impacts to stakeholders.
• Deliver status updates and technical details for awareness communications.
• Identify potential production failure scenarios and escalate as needed.
• Document application flows and outage impacts for post-incident reviews.
• Ensure data quality and accuracy of incident tickets in the system of record.
• Generate ad-hoc reports and contribute to governance during triage and fixes.
• Support and extend focus areas to breaches, load balancing, DDI, proxy, and AAA as needed.

Skills

Network Operations

Firewall

IDS/IPS

NAT & FW concepts

Troubleshooting

Wireshark

Packet capture

Splunk

Multi-vendor support

Client interfacing

Tools

CheckPoint NGFW

Fortinet FortiGate

Palo Alto

Cisco Firepower

Juniper SRX

Bluecoat

Bluecat

Aruba Clearpass

Cisco ISE

TrendMicro TippinPoint

IPS signatures

F5 LTM

Job description

NTT Singapore Pte. Ltd. is seeking an experienced Network Operations professional to support perimeter security technologies in a banking/finance environment.

You will manage triage, incident handling, and escalation for network infrastructure incidents, with a focus on firewall and IDS/IPS, DNS/DHCP/IPAM and PKI related tasks. The role requires hands-on expertise across CheckPoint NGFW, Fortinet, Palo Alto, Cisco Firepower, and Juniper SRX, plus strong communication skills to brief stakeholders