Senior Network Engineer

DA SOFTWARE PTE. LTD.; Singapore; On-site; SGD 110,000 - 180,000; Full time

Job summary

DA SOFTWARE PTE. LTD. in Singapore seeks a highly experienced Senior Network Engineer responsible for enterprise routing & switching, network security, wireless, SD-WAN and production network operations.

You will manage large-scale, business-critical networks and lead complex L2/L3 incidents independently. This hands-on role requires coordinating with infrastructure, security, application, service-provider and vendor teams to implement changes and ensure availability and performance across

Qualifications

• 8+ years hands-on enterprise network engineering experience.
• CCNA mandatory or equivalent; CCNP preferred.
• Strong knowledge of LAN/WAN and TCP/IP.
• Experience with enterprise firewall environments (Cisco/ Fortinet / Palo Alto).

Responsibilities

• Provide L2/L3 operational support for complex enterprise network environments.
• Troubleshoot critical incidents involving routing, switching, WAN, firewalls, VPN, wireless and network security.
• Configure, implement, troubleshoot and maintain Cisco routers, switches, Nexus switches, WLCs, firewalls and enterprise network infrastructure.
• Troubleshoot routing protocols including BGP and OSPF, along with HSRP, MPLS and related IP routing technologies.
• Support Cisco ASA, Cisco Firepower and FMC, FortiGate and Palo Alto firewall environments.
• Configure and troubleshoot IPSec VPN and SSL VPN, AAA, RADIUS and TACACS+.
• Support Cisco ISE / NAC environments.
• Support enterprise wireless infrastructure including Cisco WLC/Aironet and Aruba APs.
• SD-WAN technologies such as Cisco SD-WAN/Viptela, VeloCloud, Fortinet SD-WAN or Meraki.
• Perform advanced packet/network troubleshooting and isolate issues across layers.
• Monitor network health and performance using SolarWinds, Zabbix, Nagios and similar tools.
• Perform RCA for recurring and major incidents and recommend permanent corrective actions.
• Handle P1/P2 production incidents, escalations and restoration activities within SLA.
• Perform network configuration changes, upgrades, migrations and infrastructure refreshes.
• Conduct network security reviews and remediation actions.
• Participate in network design reviews for scalability, availability, resilience and security.
• Coordinate with OEMs, telecom providers, security teams and other infra teams.

Skills

L2/L3 operations

Routing & Switching

Network security

BGP/OSPF

VPN technologies

Firewall configuration

SD-WAN

Nexus switches

Incident troubleshooting

Root Cause Analysis

Education

Degree in Computer Science / IT / Network Engineering

CCNA mandatory or equivalent; CCNP preferred

ITIL certification advantageous

Tools

Cisco routers

Cisco switches

Fortinet FortiGate

Palo Alto Firewalls

Cisco ASA / FMC

Cisco ISE / NAC

SolarWinds

Nagios

Zabbix

WLC/Aironet / Aruba

Job description

Experience: 8–12+ years
Domain: Enterprise Network Infrastructure & Security
Job Summary

We are seeking a highly experienced and hands‑on Senior Network Engineer with strong expertise in enterprise routing & switching, network security, wireless, SD‑WAN and production network operations.

The candidate must have proven experience supporting large-scale, business‑critical enterprise networks and should be capable of independently troubleshooting complex L2/L3 network incidents, performing root cause analysis, implementing network changes and coordinating with infrastructure, security, application, service‑provider and vendor teams.

This is a hands‑on technical role. Candidates whose experience is primarily desktop support, service desk or basic network monitoring without strong configuration and troubleshooting experience will not be suitable.

Key Responsibilities

• Provide L2/L3 operational support for complex enterprise network environments.
• Independently troubleshoot critical network incidents involving routing, switching, WAN, firewalls, VPN, wireless and network security.
• Configure, implement, troubleshoot and maintain Cisco routers, switches, Nexus switches, WLCs, firewalls and enterprise network infrastructure.
• Troubleshoot routing protocols including BGP and OSPF, along with HSRP, MPLS and related IP routing technologies.
• Support Cisco ASA, Cisco Firepower/FMC, FortiGate and Palo Alto firewall environments.
• Configure and troubleshoot IPSec VPN, SSL VPN, AAA, RADIUS and TACACS+.
• Support Cisco ISE / Network Access Control (NAC) environments.
• Support enterprise wireless infrastructure including Cisco WLC/Aironet and Aruba APs.
• Support SD‑WAN technologies such as Cisco SD‑WAN/Viptela, VeloCloud, Fortinet SD‑WAN and/or Meraki.
• Perform advanced packet/network troubleshooting and isolate issues across network, application, security and service‑provider layers.
• Monitor network health and performance using SolarWinds, Zabbix, Nagios and similar enterprise monitoring platforms.
• Perform Root Cause Analysis (RCA) for recurring and major network incidents and recommend permanent corrective actions.
• Handle P1/P2 production incidents, escalations and restoration activities within defined SLA requirements.
• Perform network configuration changes, upgrades, migrations, device replacements and infrastructure refresh activities.
• Conduct network security reviews, identify vulnerabilities and implement appropriate remediation.
• Participate in network design reviews and provide technical recommendations for scalability, availability, resilience and security.
• Perform implementation validation and testing including FAT, SAT, UAT/OAT where applicable.
• Coordinate with OEM vendors, telecom providers, security teams and other infrastructure teams for complex issue resolution.
• Maintain accurate network diagrams, configurations, SOPs, troubleshooting guides and technical documentation.
• Follow ITIL Incident, Problem, Change and Configuration Management processes.
• Participate in scheduled maintenance, change windows and 24x7/on-call support where required.

Mandatory Technical Requirements

• 8+ years of hands‑on experience in Enterprise Network Engineering and Network Operations.
• Strong hands‑on experience in L2/L3 Network Operations, Support and Troubleshooting.
• Strong expertise in Cisco Routing & Switching in large‑scale enterprise environments.
• Strong knowledge of LAN/WAN networking, TCP/IP and enterprise network architecture.
• Hands‑on production experience with routing protocols including BGP and OSPF.
• Good working knowledge of HSRP, MPLS, VLAN, STP and related switching/routing technologies.
• Hands‑on experience with Cisco Nexus switches.
• Strong experience in Network Security and Enterprise Firewall technologies.
• Hands‑on experience with Cisco ASA, Cisco Firepower and FMC.
• Good hands‑on experience with FortiGate/Fortinet and/or Palo Alto firewalls.
• Strong experience configuring and troubleshooting IPSec VPN and SSL VPN.
• Strong knowledge of network authentication and security protocols including AAA, RADIUS and TACACS+.
• Hands‑on experience with Cisco ISE / Network Access Control (NAC) is preferred.
• Strong experience with Enterprise Wireless Networks, including Cisco WLC/Aironet and/or Aruba.
• Hands‑on exposure to SD‑WAN technologies, preferably Cisco Viptela, VeloCloud, Fortinet SD‑WAN or Meraki.
• Experience with enterprise network monitoring tools such as SolarWinds, Zabbix and Nagios.
• Strong experience handling P1/P2 incidents, L2/L3 escalations and complex production network issues.
• Proven ability to perform Root Cause Analysis (RCA) and implement permanent corrective solutions.
• Strong understanding of Incident, Problem and Change Management processes in an ITIL environment.
• Ability to independently configure, troubleshoot, implement and maintain enterprise network infrastructure, rather than only monitor and escalation incidents.
• Strong communication skills with experience coordinating with customers, vendors, service providers, security teams and other infrastructure teams.

Qualifications

• Degree/Diploma in Computer Science, Information Technology, Network Engineering or related discipline.
• Minimum 8 years of hands‑on enterprise network engineering experience.
• CCNA mandatory or equivalent practical expertise; CCNP preferred.
• ITIL certification is an advantage.
• Strong understanding of enterprise network architecture, security and high‑availability environments.
• Strong analytical and troubleshooting ability.
• Ability to independently manage complex technical incidents from diagnosis through resolution.
• Strong communication and documentation skills.
• Experience working with enterprise customers, vendors and geographically distributed technical teams.