L3 Network Engineer Job Description

Role Summary:
Responsible for advanced troubleshooting, design, implementation, and support of enterprise and data center networks. Acts as final escalation point and supports critical incidents, recent deployments, and network optimization.

Key Responsibilities
Act as final escalation (L3) for complex LAN/WAN, WLAN, VPN, and Data Center issues.
Handle P1/P2 incidents, perform deep packet analysis, and create RCA.
Design and implement network solutions; contribute to HLD/LLD.
Deploy and support BGP, OSPF, EIGRP, ISIS, MPLS, VXLAN/EVPN.
Implement and maintain configurations for routers, switches, firewalls, and load balancers.
Configure and troubleshoot firewalls, IPSec/SSL VPNs, IDS/IPS, and security policies.
Perform performance optimization, QoS tuning, and capacity planning.
Support network upgrades, migrations, and new site rollouts.




Prepare and execute change requests with risk and rollback plans (ITIL aligned).
Coordinate with OEM TAC teams and ISPs for escalations and current links.
Maintain documentation, network diagrams, SOPs, and mentor L1/L2 teams.
Experience with copper and fiber cabling.
Troubleshoot physical layer issues and maintain asbuilt cabling documentation.
Support data center expansions and current site deployments.

Required Skills
Routing: BGP, OSPF, EIGRP, ISIS
Switching: STP, VLAN, VTP, ACL, EtherChannel, VXLAN/EVPN
Security: Firewalls, VPN (IPSec/SSL), IDS/IPS
Wireless: WLAN Controllers, AP design basics
Load Balancers: F5 / A10
OEMs: Cisco, H3C, Aruba, Palo Alto, Fortinet, Check Point, Extreme, SDWAN
Tools: Packet capture and traffic analysis tools

📌 Network Engineer 3 Tamil Nadu (India)
🏢 Primus Global Technologies
📍 India