L3 Senior Network Implementation, Migration Engineer( SDWAN, Firewalls, R&S)_Kolkata

Role Summary

We are seeking an experienced Network Implementation Engineer (L3) with strong expertise in Routing & Switching, Firewall, SD-WAN, Load Balancers (F5), and Web Application Firewall (WAF) technologies. The candidate will be responsible for designing, implementing, migrating, and supporting complex enterprise network and security environments.

Key Responsibilities

Design, implement, and support enterprise network infrastructure.

Perform network implementation, migration, and transformation activities.

Configure and troubleshoot Routing & Switching technologies in large enterprise environments.

Deploy and support SD-WAN solutions across multiple locations.

Implement and manage Firewall policies, NAT rules, VPNs, and security controls.

Configure and maintain Load Balancers (F5 LTM/GTM).

Implement and support Web Application Firewall (WAF) solutions.

Perform network assessments, health checks, and optimization activities.

Troubleshoot complex Layer 2, Layer 3, and security-related issues.

Participate in change management, root cause analysis (RCA), and problem management.

Collaborate with internal teams, customers, and vendors during project implementation.

Prepare implementation plans, HLD, LLD, and operational documentation.

Provide L3 escalation support for critical incidents.

Mandatory Technical Skills

Routing & Switching

Cisco Routing & Switching

BGP

OSPF

EIGRP

MPLS

VLANs

STP/RSTP/MSTP

HSRP/VRRP

EtherChannel

IPv4 & IPv6

Firewall

Hands-on implementation and troubleshooting experience in one or more:

Palo Alto

Fortinet FortiGate

Check Point

Cisco Firepower (FTD)

Cisco ASA

SD-WAN

Cisco Viptela SD-WAN

Cisco SD-WAN

Aruba EdgeConnect (Silver Peak)

WAN Optimization

Application-Aware Routing

SD-WAN Policy Configuration

Load Balancer

F5 BIG-IP LTM

F5 GTM/DNS

SSL Offloading

Load Balancing Policies

Health Monitors

High Availability Configuration

Web Application Firewall (WAF)

F5 ASM/AWAF

Imperva WAF

Cloudflare WAF

WAF Policy Management

Application Security Rules

OWASP Top 10 Concepts

Experience Required

10+ years of experience in Network & Security domain

Minimum 5+ years of experience in implementation and migration projects.

Strong enterprise networking and security experience.

Hands-on experience in production environments.

Experience in global infrastructure deployments and support.

Preferred Certifications

CCNP Enterprise

CCNP Security

F5 Certified Administrator (101/201)

PCNSA / PCNSE (Palo Alto)

NSE 4/NSE 5 (Fortinet)

Check Point CCSA / CCSE

Cisco SD-WAN Certification

Key Competencies

Strong troubleshooting and analytical skills.

Excellent communication and stakeholder management.

Customer-facing project implementation experience.

Ability to work under pressure during critical network changes.

Good documentation and reporting skills.