Senior Network Engineer – Cisco, Juniper

IT Coalition

Senior Network Engineer securing network infrastructure for DOJ's National Security Division. Responsible for network operations, compliance, and engineering in a high-security environment.

Posted 6/30/2026full-timeWashington, DC • District of Columbia, Washington • 🇺🇸 United StatesSeniorWebsite

Tech Stack

Tools & technologies

FirewallsSwitching

About the role

Key responsibilities & impact

Network administration and support — Administer, support, and maintain enterprise network capabilities across wide area and local area networks, ensuring consistent uptime and performance for a high-security mission environment.
Operations and sustainment — Perform day-to-day network operations and support activities, including monitoring, configuration management, and routine maintenance of routing and switching infrastructure.
Change impact evaluation — Evaluate proposed network changes for operational impact prior to implementation, identifying risks to availability, security, or performance and recommending mitigations.
Performance and connectivity troubleshooting — Evaluate network performance trends and resolve network and connectivity problems, applying structured troubleshooting methodology across Layer 1 through Layer 3.
LAN performance management — Manage local area network performance and proactively troubleshoot degradations before they affect end users or mission systems.
Security compliance — Maintain network infrastructure configurations in accordance with applicable STIG guidelines, supporting the organization's continuous compliance and audit readiness posture.
Cross-functional support — Partner with applications programmers and engineering staff working within the networking environment to ensure infrastructure changes align with application and system requirements.
Documentation and reporting — Maintain accurate, up-to-date records of network configurations, changes, and incidents using Excel-based tracking tools and other documentation standards required by the program.

Requirements

What you’ll need

10+ years of progressive Network Administration/Engineering experience, including direct responsibility for enterprise-scale routing, switching, and security infrastructure in a production environment.
Demonstrated, hands-on professional experience with Cisco and Juniper technologies, including configuration, troubleshooting, and lifecycle management of routers, switches, and firewalls in an operational network.
Hardware and platform experience with some combination of the following (not all required): Cisco routers: 2500, 2600, 3600, 3800, 4500, 9200, 9300, and 1200 series Cisco Catalyst switches: 2900, 3500, 3700, 4500, 5500, 6500 series Cisco Nexus switches (1000V, 2000, 5000, 7000), ASA 5500 series, Firepower Threat Defense (FTD), Cisco ACS, and ASR 1004 routers Juniper routers, switches, and firewalls (SRX and EX series)
Strong working knowledge of core network protocols and technologies, including OSPF, BGP, IS-IS, RIP, IGRP/EIGRP, IPv6, HSRP, VRRP, AAA, TACACS, RADIUS, ACL, IPSec, GRE, PPTP, PPP, HDLC, ISL, 802.1Q, and 802.1X — with the ability to apply this knowledge to real-world design and troubleshooting scenarios, not just textbook familiarity.
Solid grounding in Layer 1 and Layer 2 troubleshooting and technologies, with the ability to isolate physical-layer and data-link-layer issues quickly in a live operational environment.
Ability to work 100% onsite in Washington, DC. This position does not support remote or hybrid work; candidates must be able to report to the DOJ NSD facility in Washington, DC on a daily basis.

Benefits

Comp & perks

Medical, dental, and vision coverage;
401(k);
Flexible Spending Account (FSA);
11 paid federal holidays;
PTO;
education reimbursement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

RoutingSwitchingNetwork SecurityConfiguration ManagementPerformance TroubleshootingChange Impact EvaluationLAN ManagementSTIG ComplianceNetwork MonitoringDocumentation Standards