Network Engineer L3

TCS Hiring!!!

Role & responsibilities

• 8-12 years of enterprise network infrastructure experience.
• 5+ years leading enterprise network operations or network engineering functions.
• Experience supporting multi-site enterprise environments and ODC or managed services operations.
• Strong hands-on expertise across Cisco, Juniper, Aruba ClearPass, Fortinet, Cisco Wireless, Aerohive, Sauron DDI, and Silver Peak platforms.
• Good understanding of network security, segmentation, NAC, firewall governance, wireless operations, DNS/DHCP, and ITIL service management.

Strong customer-facing, stakeholder management, documentation, escalation, and vendor management skills.

Preferred candidate profile

Network Operations and Governance

• Own end-to-end network operations, governance, and service delivery.
• Act as the primary escalation point for network-related incidents, outages, and performance issues.
• Ensure network availability, performance, security, compliance, and operational resilience.
• Define and maintain network SOPs, runbooks, standards, configuration baselines, change templates, and governance controls.
• Lead network service reviews, capacity planning, risk reviews, technical assessments, and continuous improvement initiatives.

LAN Infrastructure Management

• Manage enterprise LAN infrastructure based on Cisco Catalyst and Juniper switches.
• Configure and maintain VLANs, STP, EtherChannel, QoS, ACLs, port security, routing protocols, and network segmentation.
• Perform switch provisioning, software upgrades, patching, configuration backup, lifecycle management, and hardware refresh planning.
• Troubleshoot Layer 2 and Layer 3 connectivity, routing, switching, latency, and packet loss issues.

WLAN Administration

• Manage Cisco, Juniper, and Aerohive wireless infrastructure including WLCs and access points.
• Configure SSIDs, authentication policies, guest access, roaming policies, wireless security, and access control integration.
• Perform wireless capacity planning, RF optimization, channel planning, coverage validation, and performance troubleshooting.
• Monitor wireless availability, user experience, AP health, controller health, and service degradation.

DDI Services Administration

• Administer Sauron DDI services covering DNS, DHCP, and IP Address Management.
• Maintain IP inventory, subnet allocation, DNS zones, DHCP scopes, reservations, and service records.
• Support IP planning for new sites, ODC expansion, network segmentation, and project onboarding.
• Ensure DNS and DHCP service availability, backup, resiliency, and operational documentation.

Network Access Control and Authentication

• Administer Aruba ClearPass policies, enforcement profiles, authentication flows, and endpoint profiling.
• Manage 802.1X authentication, RADIUS/TACACS+ integration, guest access, BYOD onboarding, and device compliance policies.
• Troubleshoot authentication failures, certificate issues, policy mismatches, endpoint posture, and access enforcement issues.

Firewall and Network Security Management

• Manage Cisco and Fortinet firewall infrastructure, security policies, NAT, VPN, IPS, URL filtering, and access controls.
• Review and implement firewall rule changes using approved change management processes.
• Perform firewall audits, rule recertification, compliance reviews, vulnerability remediation, and security incident support.
• Coordinate with security teams for threat response, segmentation, and policy hardening.