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# Network Engineer

- **Company:** TEKSYSTEMS INC.
- **Location:** Aurora, CO, United States
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Application Firewall, Cisco Routers, Complex Networks, Computer Networks, Linux, Networking Hardware, Network Security, Network Troubleshooting, Network Architecture, Network Service, Performance Tuning, Software Systems, TCP/IP, Wide Area Networks, Computer Networking Systems, Load Balancing, Computer Network Technologies, Firewalls (Computer Science), Routing & Switching, Cisco
- **Published:** November 14, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9313891/network-engineer

## About the Role

Active TS/SCI clearance with current Full Scope Polygraph.

 - Security+ certification.
 - Experience designing, implementing, and supporting enterprise network infrastructures.
 - Strong knowledge of Cisco routing and switching technologies.
 - Experience supporting large-scale LAN/WAN environments.
 - Experience with network troubleshooting, fault isolation, and performance optimization.
 - Knowledge of firewall administration and network security technologies.
 - Experience working with load balancers and network traffic management solutions.
 - Working knowledge of Linux and Windows operating systems.
 - Strong written and verbal communication skills.
 - Ability to work effectively in a highly secure, fast-paced environment., Experience supporting classified government or intelligence community environments.
 - Familiarity with secure communications equipment and technologies.
 - Experience evaluating and implementing emerging networking technologies.
 - Ability to create detailed technical documentation and network schematics.
 - Experience supporting geographically dispersed network infrastructures.

Work Environment

 - 100% onsite in a secure facility.
 - Collaborative engineering-focused team environment.
 - Opportunity to support advanced technologies and large-scale network modernization efforts.
 - Travel requirement of up to 30%.

Desired Skills

 - Cisco Routing & Switching
 - LAN/WAN Engineering
 - Network Architecture
 - Firewalls
 - Load Balancers
 - TCP/IP
 - Linux
 - Windows
 - Network Security
 - Infrastructure Design
 - Troubleshooting & Root Cause Analysis
 - Technical Documentation

If you are a cleared Network Engineer looking to support complex, mission-critical environments and work alongside highly skilled technical teams, we encourage you to apply.

## Description

We are seeking an experienced Network Engineer to support the design, implementation, and maintenance of secure, mission-critical network infrastructure in a highly classified environment. This role is ideal for a hands-on engineer with strong Cisco networking expertise who enjoys solving complex connectivity challenges across large-scale enterprise LAN/WAN environments.

The successful candidate will play a key role in network architecture, troubleshooting, modernization efforts, and technology evaluations while ensuring reliable and secure communications across distributed environments.

Responsibilities

 - Design and plan network communication systems for large-scale enterprise environments.
 - Develop detailed network architecture diagrams, implementation plans, and technical documentation.
 - Configure, maintain, and troubleshoot Cisco routers and switches.
 - Support and optimize LAN/WAN infrastructure to ensure maximum availability and performance.
 - Troubleshoot complex network outages and connectivity issues, identifying root causes and implementing corrective actions.
 - Evaluate hardware and software solutions to meet current and future network requirements.
 - Install, configure, and support firewalls, load balancers, and network security appliances.
 - Maintain expertise in network technologies, protocols, and industry best practices.
 - Support secure communications infrastructure and related network equipment.
 - Collaborate with cross-functional engineering teams to implement network enhancements and upgrades.
 - Travel up to 30% to support deployments, upgrades, and maintenance activities at various locations.