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.

NTT DATA endeavors to make https://us.nttdata.com accessible to any and all users. If you would like to contact us regarding the accessibility of our website or need assistance completing the application process, please contact us at https://us.nttdata.com/en/contact-us. This contact information is for accommodation requests only and cannot be used to inquire about the status of applications. NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status. For our EEO Policy Statement, please click here. If you'd like more information on your EEO rights under the law, please click here. For Pay Transparency information, please click here.