Network Engineer (Mid-Level & SME)

Network Engineer TS/SCI and Full Scope Poly Reston, VA  200K-250K  Are you a highly experienced Network Engineer with a passion for secure, scalable infrastructure design and implementation? We’re looking for a Subject Matter Expert (SME) Network Engineer who thrives in complex, mission-critical environments and brings deep knowledge of network architecture, cloud integration, and Network Access Control (NAC) technologies. The ideal candidate will bring experience in enterprise network engineering, with hands-on expertise in Cisco platforms, NAC implementations, and secure hybrid-cloud network solutions. The location of this job is Herndon, VA. Responsibilities: Design, implement, and manage complex enterprise network architectures across on-prem and cloud environments (AWS, Azure, etc.) Deploy and optimize Network Access Control (NAC) solutions, particularly Cisco ISE, across a wide range of network appliances and endpoints Configure and troubleshoot core network services including routing (EIGRP, BGP), switching (STP, LACP), and security protocols (ACLs, VPNs, firewalls) Monitor network performance, identify potential threats, and implement remediation strategies proactively Support network automation, virtualization, and SDN efforts to modernize infrastructure and improve operational agility Create and maintain technical documentation including architecture diagrams, design specs, implementation plans, and operational procedures Collaborate with cross-functional teams and mentor junior engineers on network engineering best practices and security standards Requirements:  Technical Bachelors Degree  Experience in designing and managing enterprise networks with a strong focus on Cisco platforms Deep understanding of network protocols (TCP/IP, DNS, DHCP, etc.) and routing/switching technologies Proficiency with NAC platforms and security tools (Cisco ISE, Cisco ASA/FTD, etc.) Experience with Linux systems, network scripting (e.g., Python), and infrastructure automation tools Strong understanding of cloud networking principles and hybrid-cloud architectures (AWS, Azure, Google Cloud, etc.)