Senior Network Administrator

Coforge; Delhi; On-site; INR 1,200,000 - 2,100,000; Full time

Job summary

Coforge is seeking a Network Administrator – L3 in Delhi with 6+ years of experience to design, implement, and manage enterprise LAN and data center networks, ensuring high availability, security, and performance across mission‑critical environments.

You will troubleshoot, configure, and optimise routing and switching, manage Cisco devices, firewalls, and SDN/SDA environments, and engage in network automation using Python and Ansible.

Qualifications

• 6+ years of experience in network administration
• Proficient in enterprise LAN/WAN and data center networks
• Experience with routing, switching, VLANs, ACLs, and firewall configurations
• Familiarity with SDN/SDA and Cisco DNA Center
• Strong troubleshooting and incident management skills

Responsibilities

• Administer and troubleshoot enterprise LAN, WAN, and data center networks to ensure uptime
• Configure Cisco Catalyst/Nexus devices, switches, routers, and wireless controllers
• Manage VLANs, STP, VTP, EtherChannel, Inter-VLAN routing, HSRP/VRRP
• Implement dynamic routing protocols including OSPF, BGP, EIGRP
• Support SDN/SDA environments and Cisco DNA Center operations
• Configure and manage firewalls (Cisco/Fortinet/Palo Alto) and VPNs
• Perform RCA and proactive performance tuning across the network
• Maintain network topology diagrams, inventories, and operational reports
• Provide L3 support for critical incidents in 24x7 production environments

Skills

L2 support

Cisco Routers & Switches

Troubleshooting

Configuration

SDN/SDA

Education

BE/BTech CS/IT/ECE

MSc IT/CS or MCA

Tools

SolarWinds

PRTG

Nagios

Zabbix

Cisco DNA Center

Job description

Title: Network Administrator - L3

Experience: 6+ years

Location: Delhi

Skills Required: L2 support, Cisco Routers & Switches, troubleshooting, configuration

Notice Period: Immediate joiner or up to 1 Month.

Qualification: B.E./B.Tech (CS/IT/ECE) or M.Sc. (IT/CS) / MCA from a recognised university

We at Coforge are seeking a “Network Administrator – L3" with expertise in enterprise LAN, Data Centre Networks, Routing & Switching, Firewalls, and Software Defined Networking (SDN/SDA). The candidate will be responsible for designing, implementing, managing, troubleshooting, and optimising network infrastructure to ensure high availability, security, and performance of mission-critical environments.

Key Responsibilities

• Administer, configure, monitor, maintain, and troubleshoot enterprise LAN, WAN, and Data Center Networks to ensure maximum uptime and performance.
• Manage and support Cisco Catalyst, Cisco Nexus, core switches, distribution switches, routers, wireless controllers, and network appliances.
• Configure and troubleshoot VLANs, STP, VTP, EtherChannel, Inter-VLAN Routing, HSRP, VRRP, and Layer 2/Layer 3 network services.
• Implement, configure, and optimize dynamic routing protocols including OSPF, BGP, EIGRP, and Static Routing.
• Administer and support Software Defined Networking (SDN), Software Defined Access (SDA), and Cisco DNA Center (DNAC) environments.
• Configure, manage, and troubleshoot Cisco Firepower, Fortinet FortiGate, Palo Alto Firewalls, Access Control Lists (ACLs), IPSec VPNs, SSL VPNs, and Network Segmentation policies.
• Manage and support Cisco Wireless LAN Controllers (WLC), Enterprise WLAN Infrastructure, Wireless Security, RF Optimization, and Wireless Troubleshooting.
• Perform advanced troubleshooting and Root Cause Analysis (RCA) for network performance, connectivity, latency, routing, switching, firewall, and security-related incidents.
• Administer Data Center Networking technologies including Cisco Nexus, VXLAN, EVPN, High Availability Architectures, Redundancy Protocols, and Spine-Leaf Network Design.
• Monitor network infrastructure using tools such as SolarWinds, PRTG, Nagios, Zabbix, SNMP, Syslog, NetFlow, and Network Analytics Platforms.
• Perform network capacity planning, bandwidth optimization, performance tuning, and infrastructure health checks.
• Execute firmware upgrades, software updates, patch management, and lifecycle management of network devices.
• Configure and maintain network redundancy, failover mechanisms, and disaster recovery solutions.
• Support network automation initiatives using Python, Ansible, Cisco DNA Automation, and other network orchestration tools.
• Ensure compliance with organizational security standards, network policies, and industry best practices.
• Collaborate with system administration, cybersecurity, cloud, storage, and application teams for seamless infrastructure operations.
• Create and maintain network topology diagrams, inventory records, configuration backups, SOPs, technical documentation, and operational reports.
• Provide L3 support for critical incidents, major outages, escalations, and complex technical issues in 24x7 production environments.