Senior Network Engineer

DNA AI TECHNOLOGIES PTE. LTD.; Singapore; On-site; SGD 120,000 - 170,000; Full time

Job summary

DNA AI TECHNOLOGIES PTE. LTD. is seeking a hands-on Senior Network Engineer to manage and troubleshoot large-scale enterprise networks. You will leverage expertise across routing, switching, security, wireless, SD-WAN and L2/L3 production support.

The role requires independent RCA, incident management and collaboration with security, infrastructure, telecom and vendor teams to ensure network reliability and performance.

Qualifications

• 8+ years of hands-on Enterprise Network Engineering.
• Strong L2/L3 troubleshooting and production support.
• Hands-on Cisco Routing & Switching and LAN/WAN.
• Production experience with BGP and OSPF.
• Experience with Cisco Nexus.
• Firewall/security with Cisco ASA/Firepower, FortiGate and/or Palo Alto.
• IPSec/SSL VPN, AAA, RADIUS and TACACS+.
• Cisco ISE/NAC and Enterprise Wireless/WLC.
• Hands-on SD-WAN experience.
• RCA, P1/P2 incident and production troubleshooting.
• Incident, Problem and Change Management.
• CCNA mandatory; CCNP preferred.

Responsibilities

• Provide L2/L3 support for large-scale enterprise networks.
• Configure and troubleshoot Cisco routers, switches, Nexus, WLC and network infrastructure.
• Troubleshoot BGP, OSPF, HSRP, MPLS, LAN/WAN and related routing technologies.
• Support Cisco ASA/Firepower/FMC, FortiGate and Palo Alto firewalls.
• Configure and troubleshoot IPSec/SSL VPN, AAA, RADIUS and TACACS+.
• Support Cisco ISE/NAC and Enterprise Wireless/WLC environments.
• Support SD-WAN technologies such as Viptela, VeloCloud, Fortinet or Meraki.
• Handle P1/P2 incidents, escalations, RCA and permanent corrective actions.
• Perform network changes, upgrades, migrations and infrastructure refresh activities.
• Monitor network performance using SolarWinds, Zabbix, Nagios or equivalent tools.
• Follow ITIL Incident, Problem and Change Management processes.
• Coordinate with security, infrastructure, application, telecom and vendor teams.

Skills

L2/L3 support

Network troubleshooting

Cisco routing & switching

Firewall security

SD-WAN

IPSec/SSL VPN

ISE/NAC

Nexus switches

BGP

OSPF

WLC/Wireless

RCA & incident management

CCNA

CCNP

Tools

SolarWinds

Zabbix

Nagios

FMC

Job description

Domain: Enterprise Network Infrastructure & Security

Job Summary

We are seeking a hands-on Senior Network Engineer with strong experience in enterprise Routing & Switching, Network Security, Wireless, SD-WAN and L2/L3 production support.

The candidate must be capable of independently troubleshooting complex network incidents, performing RCA and managing critical production environments.

Key Responsibilities

• Provide L2/L3 support for large-scale enterprise networks.
• Configure and troubleshoot Cisco routers, switches, Nexus, WLC and network infrastructure.
• Troubleshoot BGP, OSPF, HSRP, MPLS, LAN/WAN and related routing technologies.
• Support Cisco ASA/Firepower/FMC, FortiGate and Palo Alto firewalls.
• Configure and troubleshoot IPSec/SSL VPN, AAA, RADIUS and TACACS+.
• Support Cisco ISE/NAC, enterprise wireless and WLC environments.
• Support SD-WAN technologies such as Viptela, VeloCloud, Fortinet or Meraki.
• Handle P1/P2 incidents, escalations, RCA and permanent corrective actions.
• Perform network changes, upgrades, migrations and infrastructure refresh activities.
• Monitor network performance using SolarWinds, Zabbix, Nagios or equivalent tools.
• Follow ITIL Incident, Problem and Change Management processes.
• Coordinate with security, infrastructure, application, telecom and vendor teams.

Mandatory Requirements

• 8+ years of hands-on Enterprise Network Engineering experience.
• Strong L2/L3 network troubleshooting and production support experience.
• Strong hands-on Cisco Routing & Switching and LAN/WAN.
• Production experience with BGP and OSPF.
• Experience with Cisco Nexus.
• Strong firewall/security experience with Cisco ASA/Firepower, FortiGate and/or Palo Alto.
• Strong knowledge of IPSec/SSL VPN, AAA, RADIUS and TACACS+.
• Experience with Cisco ISE/NAC and Enterprise Wireless/WLC.
• Hands-on SD-WAN experience.
• Strong RCA, P1/P2 incident and production troubleshooting capability.
• Experience with Incident, Problem and Change Management.
• CCNA mandatory; CCNP preferred.

Highly Desirable

Cisco ACI/Spine-Leaf, Viptela, VeloCloud, Meraki, FireMon, NetBrain, Splunk/SIEM, Cisco CUCM/VoIP, Azure and ITIL certification.