Network Engineer III

About the role

The Digital Sector of Leidos has multiple openings in our Joint Fires Network (JFN) NOC for a Network Engineer III supporting our Global Solutions Management-Operations II (GSMO-II) program at Scott AFB, IL.

Position Summary

Our customer, Defense Information Systems Agency (DISA), acts as the provider of GIG/Defense Information System Network (DISN) services to its customers, the department of Defense (DoD) and national security organizations. This position directly supports the DISA-provided GIG capabilities and services in the 24x7 DISA Global Operations Center (DGOC).

Primary Responsibilities

• Execute network operations to include configuration and analysis of customer circuits across optical and electro-optical multiplexers, routers, and switches.
• Perform real-time circuit redesign (alternate routing) to restore customer connectivity during scheduled and unscheduled outages and maintenance actions.
• Work directly with internal and external customers, external government agencies, and other engineering tiers to ensure maximum network availability to minimize or eliminate mission and operational impact.
• Proactively monitor network alarms across platform specific network management tools.
• Perform a variety of change management tasks which include hardware replacement, software configurations, and ASI management.
• Utilize incident management applications to document all aspects of reported outages/degradations, isolations, escalations, and resolutions during the lifecycle of a service impacting network incident.
• Assess, identify and recommend resolutions to various network incidents and/or deficiencies leveraging knowledge in one or more of following: routers, switches, crypto devices, routing, CISCO, Juniper, MSPP, optical transport network, MPLS, time division multiplexing, SDH/SONET.

Basic Qualifications

• Bachelor's degree and 4+ years of prior relevant experience; or equivalent combination of education and/or experience.
• Hold DoD-8570 IAT Level 2 baseline certification (Security+ CE or equivalent) prior to start date.
• Able to work in a 24x7 shift work environment.
• Possess deep understanding of both Transport and IP network topologies.
• Must have an active DoD Top Secret security clearance.

Preferred Qualifications

• Tech control facility or cyber transport experience
• Circuit actions and vendor experience
• IP/Transport architecture experience
• Solarwinds and JIRA experience
• Telco NOC, inside or outside plant experience.
• Experience with MS Office suite, i.e. Outlook, Excel, Word, Access, PowerPoint, TEAMs
• Experience with one or more of the following: alarm surveillance, fault management, LAN maintenance, performance management, change management.

JFN

• If you're looking for comfort, keep scrolling.
• At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it.
• We're not hiring followers.
• We're recruiting the ones who disrupt, provoke, and refuse to fail.
• Step 10 is ancient history.
• We're already at step 30 — and moving faster than anyone else dares.

Original Posting: August 31, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range $73,450.00 - $132,775.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.