Network Engineering Specialist

Req ID: 386624 

NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization, apply now.

We are currently seeking a Network Engineering Specialist to join our team in Bangalore, Karnātaka (IN-KA), India (IN).

Role Summary 

We are looking for an experienced L3 Wireless Network Engineer with strong hands-on expertise in Cisco Wireless LAN Controllers (WLC), Cisco Catalyst Wireless platforms, enterprise WLAN design, troubleshooting, and migration of wireless infrastructure from Aruba to Cisco. 

The engineer will act as a senior technical resource responsible for complex wireless incidents, problem management, design validation, implementation, optimization, and migration activities across large enterprise environments. 

The role requires strong troubleshooting capability across the complete wireless stack, including Wireless LAN Controllers, Access Points, RF, authentication, switching, DHCP/DNS, AAA/RADIUS, Cisco ISE, and client connectivity. 

Key Responsibilities 

Cisco Wireless LAN Controller – L3 Support 

Provide L3 operational and engineering support for enterprise Cisco wireless environments. 

Configure, manage, troubleshoot, and optimize: 

Cisco Catalyst 9800 Wireless LAN Controllers 

Cisco AireOS WLC platforms where applicable 

Cisco Catalyst Access Points 

Troubleshoot complex wireless connectivity, roaming, authentication, RF, performance, and client onboarding issues. 

Perform detailed root cause analysis for recurring and major wireless incidents. 

Analyse WLC and AP logs, debugs, packet captures, and client connection statistics. 

Troubleshoot issues involving: 

AP registration 

CAPWAP 

Client association 

Authentication 

DHCP 

DNS 

VLAN assignment 

Roaming 

RF interference 

Poor signal / SNR 

High channel utilization 

Client drops 

Throughput degradation 

Configure WLANs, SSIDs, policies, RF profiles, AP groups/tags, VLAN mappings, and mobility configurations. 

Perform software upgrades, controller migrations, AP upgrades, and infrastructure lifecycle activities. 

Support High Availability and redundancy configurations for wireless controllers. 

Aruba-to-Cisco Wireless Migration 

Lead or support migration of enterprise wireless infrastructure from Aruba Wireless to Cisco Catalyst Wireless. 

Assess existing Aruba environments including: 

Aruba Mobility Controllers 

Aruba Mobility Conductor/Master 

Aruba Access Points 

SSIDs 

AAA profiles 

VLAN mappings 

RF configurations 

Authentication policies 

Translate existing Aruba wireless configurations and policies into equivalent Cisco configurations. 

Develop migration methodologies, implementation plans, rollback procedures, and test plans. 

Perform Aruba-to-Cisco configuration mapping for: 

SSIDs/WLANs 

VLANs 

Authentication 

RADIUS 

802.1X 

Guest wireless 

Corporate wireless 

RF policies 

AP groups 

Access policies 

Support AP replacement and migration activities across enterprise locations. 

Validate coverage, authentication, roaming, connectivity, and application performance following migration. 

Perform pre- and post-migration health checks. 

Troubleshoot migration-related client compatibility and authentication issues. 

Work closely with site teams and field engineers during physical AP replacement and cutover activities. 

Wireless Design and Optimization 

Review wireless architecture and provide recommendations for improvements. 

Analyse RF performance and recommend channel, power, and coverage optimization. 

Understand and troubleshoot: 

2.4 GHz 

5 GHz 

6 GHz 

Wi-Fi 5 / 802.11ac 

Wi-Fi 6 / 802.11ax 

Wi-Fi 6E 

Analyse RSSI, SNR, channel utilization, interference, retransmissions, and client density. 

Support wireless capacity planning and high-density deployments. 

Review wireless survey outputs and recommend AP placement or RF changes. 

Identify coverage gaps and performance issues. 

Authentication and Cisco ISE Integration 

Strong understanding of enterprise wireless authentication technologies including: 

802.1X 

RADIUS 

EAP-TLS 

PEAP 

MAC Authentication Bypass 

Web Authentication 

Troubleshoot authentication issues between: 

Wireless clients 

Cisco WLC 

Cisco ISE 

Active Directory 

PKI/Certificate infrastructure 

Analyse RADIUS transactions and Cisco ISE authentication logs. 

Support dynamic VLAN assignment and role/policy-based access. 

Troubleshoot certificate and supplicant-related wireless issues. 

Switching and Network Integration 

Strong understanding of how wireless infrastructure integrates with LAN infrastructure. 

Troubleshoot: 

VLANs 

802.1Q trunks 

DHCP 

DNS 

Routing 

ACLs 

QoS 

Multicast 

PoE 

Troubleshoot AP switch-port connectivity and power issues. 

Support integration with Cisco Catalyst switching environments. 

Incident, Problem and Change Management 

Handle complex L3 incidents escalated from L1/L2 teams. 

Participate in P1/P2 major incident troubleshooting and technical bridge calls. 

Perform technical root cause analysis and produce RCA documentation. 

Identify recurring infrastructure issues and initiate problem-management activities. 

Prepare and review implementation plans, Method of Procedure (MOP), rollback plans, and validation procedures. 

Execute production changes during approved maintenance windows. 

Participate in Change Advisory Board discussions where technical representation is required. 

Monitoring and Operational Improvement 

Monitor wireless infrastructure using enterprise management platforms such as: 

Cisco Catalyst Center 

Cisco Prime Infrastructure 

Cisco Spaces 

Aruba AirWave 

Aruba Central 

Analyse alarms, wireless health scores, client experience, AP availability, and performance. 

Identify opportunities for automation and operational improvement. 

Develop operational runbooks, troubleshooting procedures, and technical documentation. 

Provide technical guidance and knowledge transfer to L1/L2 engineers. 

Required Technical Skills 

Mandatory Skills 

Strong hands-on experience with Cisco Catalyst 9800 Wireless LAN Controllers. 

Strong hands-on experience troubleshooting Cisco enterprise wireless environments. 

Experience with Cisco Catalyst Access Points. 

Experience migrating enterprise wireless infrastructure from Aruba to Cisco. 

Strong understanding of Aruba Wireless architecture and configuration. 

Strong knowledge of enterprise Wi-Fi architecture and 802.11 protocols. 

Strong troubleshooting experience across: 

WLC 

AP 

RF 

Authentication 

DHCP 

DNS 

VLAN 

LAN switching 

Strong knowledge of Cisco ISE and RADIUS authentication. 

Strong understanding of 802.1X and enterprise wireless authentication. 

Experience with packet captures and wireless troubleshooting tools. 

Good knowledge of Cisco Catalyst switching. 

Desirable Skills 

Cisco Catalyst Center experience. 

Cisco Spaces experience. 

Aruba Central or AirWave experience. 

Experience with Ekahau or equivalent wireless survey tools. 

Understanding of SD-Access wireless integration. 

Experience with Cisco ISE policy configuration and troubleshooting. 

Basic scripting/automation knowledge using Python, APIs, or Ansible. 

Experience supporting large global enterprise networks. 

Technical Knowledge Expectations 

The candidate should have good technical understanding of: 

IEEE 802.11 a/b/g/n/ac/ax standards 

Wi-Fi 6 / Wi-Fi 6E 

CAPWAP 

RF fundamentals 

RSSI / SNR 

Channel planning 

RRM 

Client roaming 

802.11k / 802.11v / 802.11r 

WPA2 / WPA3 

802.1X 

EAP-TLS / PEAP 

RADIUS 

DHCP / DNS 

VLANs / Trunking 

QoS 

PoE 

Mobility 

Guest Wireless 

High Availability 

Experience 

6–10+ years of overall Network Engineering experience. 

Minimum 4–5 years of hands-on enterprise Wireless experience. 

Demonstrable L3 troubleshooting experience in large Cisco wireless environments. 

Experience supporting or executing at least one significant Aruba-to-Cisco wireless migration is highly desirable. 

Experience supporting multi-site or global enterprise environments. 

Certifications – Preferred 

CCNP Enterprise 

Cisco Wireless specialist certifications 

CCIE Enterprise Wireless – highly desirable 

Aruba ACMP/ACSP or equivalent Aruba certification would be advantageous 

Key Competencies 

Strong analytical and troubleshooting capability. 

Ability to independently own complex technical incidents. 

Ability to correlate issues across wireless, LAN, authentication, and client infrastructure. 

Strong communication skills for working with customers, vendors, and internal engineering teams. 

Ability to lead technical troubleshooting calls and migration activities. 

Strong documentation and change-management discipline. 

Ability to mentor L1/L2 engineers and act as the wireless technical escalation point. 

Primary Technology Stack 

Cisco: 
Catalyst 9800 WLC, Catalyst APs, AireOS WLC, Catalyst Center, Cisco ISE, Cisco Spaces, Catalyst Switching 

Aruba: 
Aruba Mobility Controller, Mobility Conductor, Aruba APs, Aruba Central, AirWave 

Protocols / Technologies: 
802.11, CAPWAP, 802.1X, RADIUS, EAP-TLS, PEAP, WPA2/WPA3, DHCP, DNS, VLANs, QoS, RF/RRM, 802.11k/v/r 

Role Outcome 

The successful candidate will serve as the L2 technical owner for enterprise wireless services, ensuring stability and performance of the Cisco wireless estate while playing a key role in the migration and transition of existing Aruba wireless environments onto Cisco Catalyst Wireless architecture. 

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 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D.

Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client’s needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees. NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com, @nttdatafed.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form, https://us.nttdata.com/en/contact-us.

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