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

NTT DATA, Inc.; Kolkata District; On-site; INR 900,000 - 1,500,000; Full time

Job summary

NTT DATA, Inc. seeks an experienced Network Implementation Engineer (L3) to design, implement, migrate, and support complex enterprise network and security environments.

The role covers Routing & Switching, Firewall, SD-WAN, F5 load balancers, and WAF technologies across multiple locations. The ideal candidate has 10+ years in Network & Security, with 5+ years in implementation and migration projects, and hands-on production experience.

Qualifications

• 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.

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).
• Implement and support Web Application Firewall (WAF) solutions.
• Troubleshoot Layer 2/3 and security-related issues.
• Participate in change management, 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.

Skills

Routing & Switching

Firewall

SD-WAN

Load Balancers

Web Application Firewall

Tools

Fortinet FortiGate

Check Point

F5 BIG-IP

Aruba EdgeConnect

F5 GTM/DNS

Job description

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:

Fortinet FortiGate

Check Point

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

Health Monitors

High Availability Configuration

Web Application Firewall (WAF)

F5 ASM/AWAF

Imperva 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)

NSE 4/NSE 5 (Fortinet)

Check Point CCSA / CCSE

Strong troubleshooting and analytical skills.

Excellent communication and stakeholder management.

Ability to work under pressure during critical network changes.

Good documentation and reporting skills.