Senior Network Engineer

** Description*
* Leidos is seeking an experienced and motivated Senior Network Engineer to support the Defense Threat Reduction Agency (DTRA) on the Integrated Information Technology Support Services (I3TS) contract. This contract is a critical initiative to modernize and operate DTRA's enterprise IT systems. The successful candidate will play a key role in enhancing IT efficiency, security, and mission effectiveness by designing, implementing, and maintaining a resilient and secure network infrastructure.

This role will be instrumental in supporting the agency's mission to counter and prevent emerging global threats.

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* Primary Responsibilities:

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* + Design, deploy, and maintain robust network infrastructure to support enterprise systems and data pipelines.

+ Configure and optimize network hardware including routers, switches, firewalls, load balancers, and VPN solutions to ensure secure and reliable connectivity.

+ Manage and support Unified Communications, including Cisco Call Manager (CUCM), to ensure seamless voice and video collaboration.

+ Lead complex network engineering projects, including system upgrades, migrations, and new deployments.

+ Implement and manage network access control (NAC) using Cisco Identity Services Engine (ISE), including device profiling, posture assessment, and policy enforcement to support a Zero Trust architecture

+ Monitor network performance, troubleshoot latency and bandwidth issues, and implement changes to improve stability and throughput.

+ Implement and manage routing protocols such as BGP and OSPF.

+ Configure, and maintain TACLANE high-assurance cryptographic encryptors, including the implementation of Agile VLAN for Layer 2 security.

+ Troubleshoot and support portable, deployable "fly-away kits" for remote and tactical communications needs.

+ Create and maintain comprehensive documentation, including detailed network diagrams, system engineering plans, and technical standards.

+ Ensure the network design complies with all security policies, supports scalability, and aligns with operational and mission requirements, including the implementation of Zero Trust principles.

+ Collaborate with government partners, engineers, and other stakeholders to translate operational and strategic requirements into scalable, production-ready solutions.

+ Mentor and guide junior network engineers, providing technical oversight and sharing knowledge.

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* Basic Qualifications:

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* + Active Top Secret (TS) clearance with SCI eligibility.

+ Bachelor's degree in Computer Science, Electrical/Network Engineering, Information Systems, or a related technical discipline with 8-12 years of relevant experience, OR a Master's degree with 6-10 years of relevant experience.

+ Current DoD 8570/8140 baseline certification (Security+ and CCNA).

+ Proven experience in engineering and sustaining enterprise network infrastructure in DoD or other federal environments.

+ Hands-on experience with routing and switching protocols (BGP, OSPF), network security (NGFW, IDS/IPS), and load balancing.

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Experience with configuring routers, switches, firewalls, load balancers, and VPN solutions from vendors like Cisco, and Palo Alto.

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* Preferred Qualifications:

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* + Advanced networking certifications such as Cisco CCNP or CCIE.

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Experience with high-assurance cryptographic devices, specifically TACLANE (KG-175).

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Experience with Cisco Unified Communications Manager (CUCM).

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Experience with network automation and Infrastructure as Code (IaC) tools like Ansible .

+ Familiarity with Zero Trust network segmentation and micro-segmentation.

+ Experience supporting large-scale enterprise data, analytics, or platform services in secure environments.

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Experience with Remedy or Service Now ticketing systems.

+ Familiarity with TACLANE management (e.g. Gem One, CHIMERA, VINE)

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Experience with Cisco Nexus switching platforms and expertise in software-defined networking (SDN) solutions, particularly Cisco ACI, for data center automation and micro-segmentation.

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