Senior Cisco Identity Services Engine (ISE) Engineer

CGI•Washington, DC

4d•Onsite

About The Position

CGI is seeking a Senior Cisco Identity Services Engine (ISE) Engineer to lead the operation, maintenance, and support of an enterprise network access control platform in a large financial services environment. The role is based in Washington, DC and involves hands-on support for secure wired and wireless access, certificate-based authentication, identity integrations, and a distributed, highly available ISE environment. The engineer independently manages platform upgrades, certificate renewals, policy changes, vulnerability remediation, and infrastructure migrations. The role also involves troubleshooting complex authentication failures, resolving production incidents, and managing ServiceNow changes with clear implementation, validation, and rollback plans. The engineer works closely with network, wireless, endpoint, security, and infrastructure teams, as well as Cisco TAC. Strong technical ownership, production judgment, and communication are essential. Scheduled evening and weekend maintenance work is required as needed.

Requirements

5+ years of hands-on experience administering and troubleshooting Cisco ISE 3.x in distributed, multi-node enterprise environments.
Thorough understanding of network access control (NAC), AAA, 802.1X, RADIUS, EAP/EAP-TLS, and certificate-based wired and wireless authentication.
Experience managing ISE authentication and authorization policies, policy sets, identity sources, Active Directory group mappings, and security group-based access controls.
Practical knowledge of enterprise PKI, including certificate chains, CA trust, renewals, replacements, and their impact on endpoint authentication.
Ability to independently execute ISE upgrades, patches, node maintenance, and vulnerability remediation while maintaining platform availability.
Strong troubleshooting skills using ISE Live Logs, packet captures, debug output, and Splunk to trace authentication failures and identify root causes.
Experience owning ServiceNow production changes, including risk assessments, implementation steps, validation, rollback procedures, and post-change documentation.
Working knowledge of Cisco Catalyst switching, enterprise wireless, DNS, firewall connectivity, and syslog integrations.
Experience supporting infrastructure migrations, node deployment and retirement, high availability, and configuration lifecycle management.
Ability to coordinate major incident resolution, work with Cisco TAC, document corrective actions, and guide other engineers.
Bachelor's degree in computer science, Information Systems, or a related field.

Nice To Haves

Experience in financial services or another highly regulated enterprise environment.
Familiarity with AWS and hybrid infrastructure supporting enterprise network and identity services.
Experience with REST APIs, Python, Ansible, Terraform, or similar tools for operational automation.
Experience connecting Splunk monitoring and alerts to ServiceNow incident workflows.
CCNP Security, CCNP Enterprise, or relevant Cisco ISE training.
Cisco certifications and ISE-specific training.

Responsibilities

Lead the operation, maintenance, and support of an enterprise Cisco ISE network access control platform.
Support secure wired and wireless access, certificate-based authentication, identity integrations, and a distributed, highly available ISE environment.
Manage ISE upgrades, patches, node maintenance, certificate renewals, policy changes, vulnerability remediation, and infrastructure migrations.
Troubleshoot complex authentication failures using ISE Live Logs, packet captures, debug output, and Splunk.
Resolve production incidents and coordinate major incident resolution.
Manage ServiceNow production changes, including risk assessments, implementation steps, validation, rollback procedures, and post-change documentation.
Support infrastructure migrations, node deployment and retirement, high availability, and configuration lifecycle management.
Work with network, wireless, endpoint, security, and infrastructure teams, and coordinate with Cisco TAC.
Document corrective actions and guide other engineers.