Lead Network Security Engineer

This role is four days onsite at our Seneca One Buffalo, NY location, with the flexibility to work from home one day per week Overview:  Responsible for implementing and supporting enterprise-scale Cisco Identity Services Engine (ISE) solutions and related network access control technologies. Enhances secure access controls, authentication services, device visibility, and network segmentation capabilities across wired, wireless, VPN, and cloud-connected environments.

Assists the technical subject matter expert for Cisco ISE, authentication infrastructure, and Zero Trust initiatives, while mentoring less experienced engineers and supporting day-to-day operations and strategic cybersecurity projects. Responsible for designing and implementing large scale-scale security systems and solutions to develop or enhance new or existing security solutions, solving advanced complex problems or enhancements. Acts as knowledge resource for and trains less experienced engineers.

Completes day-to-day support activities and special projects.

Primary Responsibilities:

Implement Cisco ISE-based Network Access Control (NAC) solutions supporting enterprise-wide authentication, authorization, and accounting (AAA) services.

Configure and maintain Cisco ISE policies, including 802.1X authentication, RADIUS, TACACS+, device profiling, posture assessment, guest access, and BYOD onboarding.

Assist in developing and maintaining role-based access controls, dynamic authorization policies, and network segmentation strategies using technologies such as Cisco Trust Sec and Security Group Tags (SGTs).Support testing and validation activities for Cisco ISE deployments, upgrades, patches, integrations, and policy changes across wired, wireless, and VPN environments.

Manage deployment and lifecycle management of Cisco ISE infrastructure, including distributed nodes, high-availability configurations, certificates, and identity source integrations.

Maintain the integration of Cisco ISE with Active Directory, LDAP, PKI, certificate services, endpoint management platforms, SIEM solutions, and security orchestration tools.

Develop automation and orchestration capabilities to streamline user provisioning, policy management, endpoint onboarding, compliance validation, and operational support activities.

Analyze authentication, authorization, and network access events to identify security risks, optimize policies, and improve overall user experience.

Troubleshoot complex authentication, authorization, certificate, device posture, and network access issues across enterprise environments.

Partner with Network Engineering, Cybersecurity, Infrastructure, and Identity teams to implement secure access solutions aligned with Zero Trust architecture principles.

Serve as a technical liaison with Cisco and other vendors to resolve advanced support issues, evaluate product enhancements, and optimize solution performance.

Assist leadership with product lifecycle management, including licensing, hardware refresh planning, software upgrades, certificate management, and technology roadmap development.

Develop standards, procedures, and best practices for identity-driven network access control and secure network segmentation.

Act as a technical mentor and knowledge resource for junior engineers and operations teams.

Understand and adhere to the Company's risk and regulatory standards, policies, and controls in accordance with the Company's Risk Appetite. Design, implement, maintain, and enhance internal controls to mitigate risk on an ongoing basis. Identify risk-related issues requiring escalation to management.

Promote an environment that supports belonging and reflects the Company's values.

Maintain internal control standards, including timely…