L3 Network Engineer

Your tasks

L3 Network Support & Troubleshooting

• ProvideL3 technical support for complex network incidents escalated from L1/L2 teams.
• Troubleshoot complex issues across LAN, WAN, Internet, WLAN, VPN, routing, switching, and firewall environments.
• Perform detailed network analysis using logs, packet captures, routing tables and network monitoring tools.
• Lead troubleshooting for major incidents and provide technical support during critical outages.
• Perform root cause analysis (RCA) and identify permanent corrective actions.
• Provide technical guidance and mentoring to L1/L2 network engineers.

Network Infrastructure Management Provide hands-on support and administration across a multi-vendor network environment, including:

Routing & Switching

• Configure and troubleshoot BGP, OSPF, VLAN, STP, VRF, trunking, LACP/EtherChannel and inter-VLAN routing.
• Troubleshoot routing and connectivity issues across LAN, WAN and Internet environments.
• Analyse routing paths and network traffic to identify performance and connectivity issues.
• Support network redundancy, high availability and failover configurations.

Firewall & Network Security -Configure, troubleshoot and maintain Fortinet and Palo Alto firewalls.

• Support firewall policies, NAT, VPN, routing and security profiles.

-Troubleshoot application connectivity and firewall-related issues.

• Work closely with cybersecurity teams on network security requirements.
• Review and implement firewall changes in accordance with approved change-management processes.

Wireless& SD-WAN

• Support enterprise wireless infrastructure across Cisco, Meraki, UniFi and other wireless platforms.

-Troubleshoot wireless connectivity, authentication, coverage and performance issues.

• Support SD-WAN and Internet connectivity where applicable.
• Monitor network performance and proactively identify potential issues.

Network Projects & Changes -Participate in network migration, upgrade, refresh and infrastructure improvement projects.

• Perform network device upgrades, configuration changes and technology migrations.
• Prepare implementation and rollback plans.
• Conduct pre-change and post-change validation.

-Coordinate with internal teams, vendors and stakeholders during network implementations.

• Ensure all network changes are properly documented and communicated.

Incident & Problem Management

• Take ownership of complex network incidents through to resolution.

-Participate in Major Incident Management and provide technical updates.

• Perform detailed RCA for critical and recurring incidents.
• Identify opportunities to improve network reliability and reduce recurring incidents.
• Maintain technical knowledge articles and troubleshooting procedures.

Requirements

• Cisco –Routers, switches, Catalyst, Nexus and related networking technologies.
• Fortinet– FortiGate firewalls, VPN, security policies and Forti Manager/Forti Analyzer where applicable.
• Palo Alto– Next-generation firewalls, security policies, VPN and related security technologies.
• Juniper –Routers, switches and enterprise networking platforms.
• UniFi –Wireless and LAN infrastructure.
• Cisco Meraki – Switches, wireless access points, security appliances and cloud-managed networking.

Networking

• Strong knowledge of TCP/IP, DNS, DHCP, NAT, VLAN, STP, QoS, VPN and network security.
• Strong hands-on experience with routing and switching.
• Good knowledge of BGP and OSPF.
• Strong troubleshooting skills using packet captures and network diagnostic tools.

-Experience with network monitoring and management platforms.

Cisco|Routing, switching, Catalyst/Nexus Fortinet|FortiGate, Firewall, VPN, Security Policies Palo Alto|NGFW, Security Policies, VPN, NAT Juniper|Routing, Switching and Troubleshooting CiscoMeraki| Switching, Wireless, Security Appliance UniFi|Switching, Wireless and Network Management

Experience across multiple vendors is highly preferred.

Qualification s& Experience

• Diploma or Degree in IT, Computer Science, Networking or a related discipline.
• 5–8+years of network engineering experience, with strong L3 troubleshooting experience.
• Hands-on experience supporting enterprise network environments.

-Experience working in a multi-vendor network environment.

• CCNP, JNCIP, Fortinet, Palo Alto or equivalent certifications are preferred.
• ITIL experience and knowledge of Incident, Problem and Change Management processes.

-Experience supporting regional or global environments is an advantage.

Key Competencies

• Strong technical troubleshooting and analytical skills.
• Strong ownership and accountability.
• Able to independently troubleshoot complex network issues.
• Strong communication and stakeholder-management skills.
• Able to work effectively under pressure during major incidents.
• Good documentation and reporting skills.
• Proactive approach to network monitoring and problem prevention.
• Ability to mentor and provide technical guidance to L1/L2 engineers.

How to apply

Interested applicants, please Email, fabianling@recruitexpress.com.sg