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# Senior Network Engineer

- **Company:** TEKSYSTEMS INC.
- **Location:** Denver, CO, United States
- **Experience:** Expert
- **Salary:** $166,400
- **Contract:** Temporary contract
- **Skills:** IEEE 802.1X, Data Analysis, User Authentication, Border Gateway Protocol, Computer Networks, Intrusion Detection and Prevention, Network Security, NetFlow, Network Architecture, Cisco Nexus Switches, Open Shortest Path First (OSPF), Public Key Infrastructure, Remote Authentication Dial in User Service (RADIUS), Web Application Security, TCP/IP, Wireshark, Virtual Local Area Networks, Wireless Networks, Network Switches, Network Routers, Identity Services Engine, Network Access Control, Performance Testing, Cybercrime, PSN, Cisco Switches, Cisco
- **Published:** November 11, 2026
- **Apply:** https://www.careercircle.com/jobs/all/all/usa/co/denver/9692be35-e12d-4609-9156-009f2de1c058

## About the Role

cisco ise, network access control, cisco switches, skyhigh, switches, router, netflow, stealthwatch, ospf, vlan, vrf, wireshark, 5+ years of hands-on enterprise Cisco ISE experience.

Experience designing and troubleshooting distributed Cisco ISE deployments, including PAN, PSN, and MnT nodes.

Strong knowledge of wired/wireless 802.1X, MAB, RADIUS, and network authentication.

Experience with Cisco switching, enterprise network infrastructure, and authentication troubleshooting.

Understanding of certificate-based authentication, PKI integration, and certificate lifecycle management.

Experience supporting enterprise security engineering deployments and complex technical migrations.

Ability to work independently and communicate effectively across technical and non-technical teams.

Experience with Cisco Secure Network Analytics (SNA), NetFlow/IPFIX, behavioral analytics, and network threat visibility, as specified in the official requisition.

Desired Qualifications

Cisco Catalyst, Nexus, and wireless infrastructure.

TCP/IP, BGP, OSPF, VLANs, VRFs, and Wireshark.

Insider threat detection, data exfiltration analysis, and threat hunting.

Skyhigh Secure Web Gateway and proxy policy exposure.

Experience in large, regulated financial services environments., Individual compensation offered for this position within this range will depend on many factors, including qualifications, skills, relevant experience, job knowledge, geographic location, internal equity, and other pertinent job-related factors.

## Description

Operations
IEEE 802.1X
Communication
Authentications
Legal Discovery
Cisco Switching
Threat Modeling
Network Switches
Network Security
Threat Detection
Security Controls
Project Management
Business Valuation
Financial Services
Technical Standard
Network Engineering
Operations Security
Enterprise Security
Performance Testing
Behavioral Analytics
Full Stack Development
Network Infrastructure
Network Access Control
Business Transformation
Border Gateway Protocol
Web Application Security
Technical Subject Matter
Public Key Infrastructure
IP Flow Information Export
Security Requirements Analysis
Open Shortest Path First (OSPF)
Troubleshooting (Problem Solving)
Virtual Local Area Network (VLAN)
Cisco Identity Services Engine (ISE)
Remote Authentication Dial In User Service (RADIUS), Seeking an experienced Network Security Engineer to support multiple enterprise security engineering initiatives focused on Network Access Control (NAC), authentication modernization, and secure network access.

The engineer will serve as a technical subject matter expert supporting Cisco Identity Services Engine (ISE), with an emphasis on improving authentication standards across a large enterprise environment. Responsibilities include supporting the migration of network-connected assets from weaker authentication methods toward stronger 802.1X and certificate-based authentication.

Key Responsibilities

Engineer, configure, troubleshoot, and support Cisco ISE infrastructure across distributed enterprise environments.

Support large-scale migration from MAC Authentication Bypass (MAB) and other weaker authentication methods toward stronger 802.1X authentication.

Coordinate certificate provisioning, deployment, renewal, and authentication dependencies with PKI and infrastructure teams.

Support network asset discovery, classification, authentication policy validation, and migration readiness.

Partner with network engineering, operations, security, and application teams to execute engineering initiatives.

Incorporate security requirements, architecture documentation, threat models, and technical standards into solution development.

Perform integration, regression, and performance testing, analyze results, and troubleshoot root causes.

Identify security control gaps and implement remediation plans.

Document deployment procedures, technical dependencies, operational requirements, and implementation results.

Provide technical guidance to project managers and cross-functional stakeholders.