Tier 3 Network Systems Subject Matter Expert

Description

Leidos is seeking an experienced Network Systems Subject Matter Expert (SME) to provide Tier 3 sustainment support to a mission critical IP voice transport network at Scott AFB, IL . To be successful, you should have extensive experience optimizing, implementing, and maintaining complex networks with a focus on security, high availability, and performance.You will also work closely with operations, management, and customer stakeholders to ensure the network is both secure and functioning optimally.

This position requires U.S. citizenship with an active Top Secret clearance with SCI eligibility.

Primary Responsibilities :

Provide system and network optimization design, implementation, testing, and maintenance support for a complex enterprise network using industry best practices.

Resolve escalated network and security support issues (Tier 3).

Independently conduct network assessments, identify possible vulnerabilities, and recommend / develop solutions to problems found.

Lead development of network documentation, diagrams, and standard operating procedures. This includes creating and maintaining Engineering Implementation Plans (EIPs).

Support Continuous Service Improvements (CSI).

Active participation in Root Cause Analysis for Problem Management activities.

Work with cross-functional teams to plan and execute network upgrades, migrations, and deployments.

Manage vendor relationships, including engagement on Incident Support activities and ensure timely delivery of program deliverables.

Monitoring, capacity planning, backup, and recovery of network equipment

Keep up with technology trends. Evaluate and recommend new technologies, tactics, and tools to improve service delivery.

Mentor and coach junior engineers, including providing training and support as required.

Provide testing support for the setup, installation, and transition to operations of service infrastructure devices, NMS and tools.

Support administration, patching, configuration, and sustainment activities for JITC lab components hosted at DISA Ft Meade.

Function as the primary COOP capability support engineer.

Review ACAS scanning and findings reports. Provide engineering support to the program ISSM / ISSO to mitigate findings.

Support lifecycle sustainment and refresh activities.

Utilize the designated ticketing system to document resolution and develop knowledge management artifacts.

Consult and collaborate with OEM resident and TAC engineering support provided by the government to ensure program operational and engineering needs are supported.

Core Qualifications :

Bachelor's degree and 12-15 years of prior relevant experience or Masters with 10-13 years of prior relevant experience. Specific years of related work experience may be substituted for a degree at the Hiring Manager's discretion.

Ability to work in a team environment with excellent communications and interpersonal skills.

Active DoD clearance at the Top-Secret level with SCI eligibility

Security+ Certification or other DOD 8570 IAT Level II Certification

Extensive knowledge of defense-in-depth principles, Network and Security architecture, network topology, IT device integrity, and common security elements.

10+ years' experience engineering and troubleshooting networks, including extensive routing and switching experience such as one or more of the following : MPLS, VPNs, routing protocols i.e. BGP, OSPF, IS-IS, switching protocols i.e. Spanning Tree Protocol, VLANs, LLDP, VoIP, Multicast protocols and emerging network technologies.

Strong understanding and in-depth knowledge of IP network / subnet addressing.

Experienced and adept at developing and maintaining technical documents, analyses, and reports.

Experience developing and presenting technical information to senior customer management, customer stakeholders, and company management.

Ability to travel up to 10% including OCONUS potential travel.

Preferred Qualifications :

Experience with Juniper route, switch and security appliances. (MX, EX, SRX)

Experience with Session Initiation Protocol (SIP) implementation and design concepts.

Experience with Ribbon Session Border Controllers (SBC)

Experience with SolarWinds configuration and maintenance.

Experience with Splunk

Experience with change, configuration and performance management NetOps concepts.

IAT Level III Certification (i.e. CISSP or equivalent).

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting : August 21, 2025

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 :

Pay Range $112,450.00 - $203,275.00

The Leidos pay range for this job level is a general guideline onlyand 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.

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