Senior Network Security Engineer — Enterprise Networking & Firewalls

NTT SINGAPORE PTE. LTD.

Singapore

On-site

SGD 90,000 - 150,000

Full time

14 days+

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Job summary

NTT SINGAPORE PTE. LTD. is seeking an experienced Network Engineer to design, implement and maintain our enterprise LAN/WAN infrastructure, ensuring high availability and secure connectivity across the organisation.

You will troubleshoot complex network issues, manage devices and security appliances, and collaborate with Infrastructure, Cybersecurity, Cloud and Operations teams on critical projects. CCNP is required, with 5+ years in enterprise environments and strong Cisco routing/switching

Qualifications

Diploma or Bachelor's degree in Computer Science, Information Technology, Engineering or a related discipline.
5+ years of relevant Network Engineering experience in enterprise environments.
CCNP certification is required.
Strong hands-on experience in Cisco routing and switching.
Strong understanding of TCP/IP, VLAN, routing, switching, DNS, DHCP, VPN and network security.

Responsibilities

Design, implement, configure and maintain enterprise LAN/WAN and network infrastructure.
Manage and troubleshoot network devices, security appliances, load balancers and network services.
Perform Level 2/3 troubleshooting, root cause analysis and resolution of complex network incidents.
Monitor network performance, availability, capacity and security, and proactively identify potential issues.
Support network infrastructure upgrades, migrations, technology refreshes and improvement initiatives.
Implement and maintain network security policies, firewall configurations and secure connectivity.
Support DNS, DHCP and IP address management across the enterprise environment.
Work closely with Infrastructure, Cybersecurity, Cloud, Application and Operations teams on network-related projects and incidents.
Coordinate with technology vendors and service providers for technical escalations and issue resolution.
Maintain accurate network diagrams, configurations, documentation, SOPs and operational procedures.
Participate in change management, incident management and scheduled maintenance activities.
Ensure network infrastructure adheres to organisational security, resilience, availability and compliance standards.
Participate in disaster recovery, business continuity and infrastructure resilience initiatives where required.