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Job Title: Network Engineer L3 (ACI & SD-WAN Specialist)

Job Summary

We are seeking a highly skilled and experienced L3 Network Engineer to join our Network Operations and Engineering team. The ideal candidate will possess deep expertise in Cisco ACI, Versa SD-WAN, enterprise Routing & Switching, and network troubleshooting. The role requires providing Level 3 support, designing, implementing, optimizing, and maintaining complex enterprise network infrastructures while ensuring high availability, performance, and security.

Key Responsibilities

Network Operations & Support

• Provide Level 3 support for enterprise network infrastructure and critical incidents.
• Act as the technical escalation point for complex network issues.
• Perform root cause analysis (RCA) and implement permanent fixes for recurring problems.
• Lead major incident resolution and problem management activities.

Cisco ACI Administration

• Design, deploy, configure, and troubleshoot Cisco ACI environments.
• Manage ACI Fabric, Tenant configurations, VRFs, Bridge Domains, EPGs, Contracts, and L3Outs.
• Perform firmware upgrades and maintenance activities within ACI environments.

Versa SD-WAN Management

• Configure, administer, and troubleshoot Versa SD-WAN infrastructure.
• Manage Controllers, Director, Analytics, and Edge devices.
• Implement application-aware routing, segmentation, and security policies.
• Support WAN optimization and network transformation initiatives.

Routing & Switching

• Configure and troubleshoot Layer 2 and Layer 3 network technologies.
• Manage enterprise routing protocols including:
  • BGP
  • OSPF
  • EIGRP
  • IS-IS (preferred)
• Configure and support switching technologies:
  • VLANs
  • STP/RSTP/MST
  • EtherChannel/LACP
  • VPC
  • HSRP/VRRP
  • VXLAN (preferred)
• Perform network capacity planning and optimization.

Network Security & Compliance

• Work closely with security teams to implement network security controls.
• Support access control, segmentation, and secure network designs.
• Ensure adherence to organizational and industry standards.

Documentation & Collaboration

• Prepare and maintain network diagrams, standard operating procedures (SOPs), and technical documentation.
• Participate in architecture reviews and network design discussions.
• Mentor L1 and L2 engineers and provide technical guidance.

Required Qualifications

Education

• Bachelor's degree in Computer Science, Information Technology, Electronics, Telecommunications, or related field.

Experience

• 7+ years of experience in enterprise networking.

Certifications (Preferred)

• Cisco CCNP Enterprise
• Cisco CCIE Enterprise Infrastructure (Preferred)

Location: Kolkata
Experience: 7+
Employment Type: Full Time
Shift: 24x7 Support / Hybrid (as applicable)

Workplace type:

About NTT DATA
NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune

Global 100. We are committed to accelerating client success and positively impacting society through

responsible innovation. We are one of the world’s leading AI and digital infrastructure providers, with

unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and

application services. Our consulting and industry solutions help organizations and society move

confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more

than 70 countries. We also offer clients access to a robust ecosystem of innovation centers as well as

established and start-up partners. NTT DATA is part of NTT Group, which invests over $3 billion each

year in R&D.

Equal Opportunity Employer
NTT DATA is proud to be an Equal Opportunity Employer with a global culture that embraces diversity. We are committed to providing an environment free of unfair discrimination and harassment. We do not discriminate based on age, race, colour, gender, sexual orientation, religion, nationality, disability, pregnancy, marital status, veteran status, or any other protected category. Join our growing global team and accelerate your career with us. Apply today.

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