Senior Network Engineer-Walkin Drive

Job Role: Senior Network Engineer (Cisco LAN, WLAN & Security)-Walkin Drive

Experience: 7+ year Location: Chennai The Level 3 Network Engineer will act as a Subject Matter Expert (SME) for enterprise Cisco network environments, responsible for advanced troubleshooting, design support, and implementation across Wired LAN, Wireless LAN, Firewalls, Cisco DNA Center (DNAC), and Cisco Identity Services Engine (ISE). The role involves handling high-impact incidents, driving root cause analysis, and supporting continuous improvement of network services.

Key Responsibilities Network Operations & Troubleshooting

• Lead advanced (L3) troubleshooting for complex LAN, WLAN, and security-related incidents.
• Perform root cause analysis (RCA) for recurring and high-severity network issues.
• Provide escalation support to L2 teams and mentor engineers on complex cases.

Wired & Wireless LAN

• Design, configure, and optimize Cisco enterprise LAN environments (Catalyst switches).
• Manage and troubleshoot Cisco Wireless infrastructures (WLCs, Access Points).
• Support large-scale campus and site wireless deployments, including performance tuning and RF optimization.

Network Automation & Visibility

• Operate and maintain Cisco DNA Center (DNAC) for:
• Network assurance and health monitoring
• Configuration management and compliance
• Software image and patch management
• Use DNAC insights to proactively identify and remediate network risks.

Network Security & Access Control

• Configure and support Cisco ISE for:
• Network access control (802.1X, MAB)
• Policy enforcement and guest access
• Integration with wired and wireless networks
• Manage firewall platforms (Cisco Firepower / ASA or equivalent):
• Firewall policy and rule management
• NAT, ACLs, and high-availability configurations
• Security incident investigation and response

Design & Change Management

• Support network design reviews and implementation for new sites or enhancements.
• Participate in change planning, risk assessment, and execution for network changes.
• Ensure configurations follow security standards and enterprise best practices.

Transition & Knowledge Transfer Responsibilities

• Actively participate in

network service transitions , including knowledge transfer (KT) from incumbents or customer teams.

• Review and validate

asis network architecture, configurations, SOPs, and documentation during transition phases.

• Support

stabilization activities posttransition, ensuring smooth handover to steadystate operations.

• Identify gaps, risks, and improvement opportunities during transition and recommend corrective actions.
• Collaborate with stakeholders to ensure

operational readiness , tool onboarding, and access enablement.

Collaboration & Documentation

• Work closely with customers, vendors, and internal stakeholders.
• Engage with OEM TAC (Cisco) for advanced issue resolution.
• Maintain accurate network documentation, diagrams, and SOPs.

Required Skills & Experience Experience

• 7-10 years of hands-on experience in enterprise network engineering roles.
• Strong exposure to global or large-scale LAN/WLAN environments.

Technical Skills

• Cisco Switching: Catalyst series (9K or equivalent)
• Cisco Wireless: WLCs and, Access Points
• Cisco DNA Center (DNAC): Assurance, automation, compliance
• Cisco ISE: NAC, authentication, authorization, guest access
• Firewalls: Cisco Firepower / ASA (or equivalent enterprise firewalls)
• Strong knowledge of TCP/IP, VLANs, STP, routing basics (OSPF/BGP fundamentals)

Certifications (Preferred)

• CCNP Enterprise / CCNP Security
• Cisco ISE or Wireless specialization (good to have)

Soft Skills & Behavioral Expectations

• Strong analytical and problem-solving skills
• Ability to work under pressure in high-impact incidents
• Clear communication with both technical and non-technical stakeholders
• Ownership mindset and attention to detail
• Willingness to mentor junior engineers