Network Engineering Specialist
NTT DATA, Inc.
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Job summary
NTT DATA, Inc. is seeking an experienced L3 Wireless Network Engineer for our Bangalore, India team. The role focuses on Cisco WLC environments, Aruba migration projects, and enterprise WLAN design and optimization.
You will troubleshoot complex wireless incidents, analyze RF performance, and participate in migration planning, testing, and cutover activities across large campuses.
Qualifications
- Strong hands‑on experience with Cisco Catalyst 9800 WLCs.
- Troubleshooting Cisco enterprise wireless environments.
- Experience migrating enterprise wireless infrastructure from Aruba to Cisco.
- Strong understanding of Aruba Wireless architecture and configuration.
- Knowledge of 802.11 protocols and enterprise Wi‑Fi architecture.
Responsibilities
- Provide L3 operational and engineering support for enterprise Cisco wireless environments.
- Configure, manage, troubleshoot, and optimize WLCs, APs, and RF profiles.
- Lead Aruba-to-Cisco migration projects including migration plans and testing.
- Perform detailed root‑cause analysis for major wireless incidents.
- Monitor and optimize wireless performance, roaming, and authentication.
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Job description
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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.
We are currently seeking a Network Engineering Specialist to join our team in Bangalore, Karnātaka (IN-KA), India (IN).
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.
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
- DHCP
- DNS
- VLAN assignment
- Roaming
- RF interference
- Poor signal / SNR
- High channel utilization
- 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 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.
SSIDs/WLANs
- VLANs
- 802.1X
- 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.
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.
Strong understanding of enterprise wireless authentication technologies including:
- 802.1X
- EAP-TLS
- PEAP
- MAC Authentication Bypass
- Wireless clients
- 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.
Strong understanding of how wireless infrastructure integrates with LAN infrastructure.
Troubleshoot:
- VLANs
- DHCP
- DNS
- Routing
- ACLs
- QoS
- PoE
Troubleshoot AP switch-port connectivity and power issues.
Support integration with Cisco Catalyst switching environments.
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.
Participate in Change Advisory Board discussions where technical representation is required.
Monitor wireless infrastructure using enterprise management platforms such as:
- 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.
- 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
- 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.
- 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.
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
- RSSI / SNR
- RRM
- Client roaming
- 802.11k / 802.11v /
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