Senior Network Engineer

Metron•Reston, VA

21d•Onsite

About The Position

Our Reston, VA offices is seeking a Senior Network Engineer to support enterprise network operations, secure infrastructure, campus connectivity, and hands-on implementation across corporate and secure environments. This is an execution-focused senior technical role. The Senior Network Engineer will configure, troubleshoot, maintain, document, and improve network systems while working closely with network architecture, systems engineering, cybersecurity, vendors, and program teams. The ideal candidate is a hands-on senior network engineer with strong Cisco experience, disciplined change-management habits, and the ability to troubleshoot complex network, VPN, access-control, and secure-environment issues. Occasional after-hours/weekend maintenance and emergency response required.

Requirements

Able to work on-site in Reston, VA
Eligible to obtain and maintain a U.S. security clearance
Willing and able to work in classified, secure, or compliance-bounded environments
Able to support occasional after-hours and weekend maintenance or emergency response
7+ years of hands-on enterprise networking experience
5+ years supporting Cisco enterprise networking platforms
Experience with switching, routing, VLANs, wireless, VPNs, DNS, firewalls, and network security operations
Experience troubleshooting site-to-site VPNs, routing, latency, packet loss, DNS, and service-availability issues
Experience supporting secure, classified, regulated, government, defense, or security-controlled infrastructure
Experience following formal change-management, testing, backout, and documentation practices
Ability to coordinate across network, systems, cybersecurity, helpdesk, vendor, and program teams

Nice To Haves

Active U.S. security clearance
Experience with Cisco ISE, TACACS+, RADIUS, or network access-control policy administration
Experience with TACLANE, encrypted transport, secure enclave networking, or air-gapped environments
Experience with Cisco firewall/security platforms or enterprise firewall policy troubleshooting
Experience with Active Directory, Entra ID, ADFS, SSO, claims, UPN/email hygiene, or ServiceNow identity integrations
Working familiarity with virtualization or platform environments such as VMware, Nutanix, Hyper-V, Linux, storage, or backup systems
Experience in defense contracting, government programs, CMMC, NIST 800-171, or other compliance-driven environment

Responsibilities

Configure, maintain, and troubleshoot enterprise LAN, WAN, wireless, VPN, firewall, DNS, and secure network infrastructure.
Execute network changes, switch cutovers, routing updates, firewall/security changes, and connectivity improvements.
Support campus, data center, colocation, carrier, ISP, and secure-environment network operations.
Administer Cisco switching, wireless, security, and related enterprise networking platforms.
Troubleshoot site-to-site VPNs, routing issues, latency, packet loss, DNS behavior, firewall behavior, and service-connectivity problems.
Support network access-control workflows, including Cisco ISE, TACACS+, RADIUS, and device-administration policies.
Coordinate Cisco TAC, carrier, ISP, and vendor support cases through resolution.
Follow formal change-management practices, including implementation plans, test plans, risk analysis, backout plans, and maintenance-window coordination.
Maintain accurate network diagrams, change records, implementation notes, operational runbooks, and troubleshooting documentation.