The Digital Modernization Sector at Leidos is seeking a Tier III O&M Network Engineer to support the customer’s various wide area networks (WANs) and local area networks (LANs). This position will provide routing to an enterprise level infrastructure across multiple classifications and act as subject matter experts in routing technologies across multiple vendors.

The job duties of Tier III O&M Network Engineer are as follows:

• Tier III O&M of Juniper and Cisco routers include extensive troubleshooting at the layer 2 and layer 3 level and implementation of routing changes.
• Troubleshooting network issues related to connectivity, latency, asymmetric routing.
• Implementation of routing and troubleshooting issues related to the following protocols: OSPF, BGP, MPLS, VRF’s, VPN’s
• Support technical exchange meetings to help resolve other ISP and application owner issues.
• Support problem management to conduct root cause analysis of recurring issues.
• Provide day-to-day Operations and Maintenance (O&M) support for incident management events and outages.
• Collaborate with IT staff on projects and initiatives.
• Work with corresponding technical support teams as required to resolve network traffic concerns.
• Utilize monitoring tools and log collectors to provide in-dept analysis of traffic anomalies and issues.
• Candidate will be on call after hours on a rotational basis.
• Not required but experience with Palo Alto, Cisco Adaptive Security Appliance (ASA), and Forcepoint firewall equipment and applications is a plus.

Requirements

• Required Clearance: TS/SCI and Poly
• Candidate must have 16 years of experience that can be a combination of work history and education. This equates to a Doctorate and 8 years, master’s and 10 years, bachelor’s and 12 years, associates and 14 years or HS diploma and 16 years.
• Must comply with DoD 8570 Information Assurance Technical (IAT) Level 2.
• Experience with configuring and troubleshooting Juniper and Cisco routers and switches.
• Experience with protocols such as OSPF, BGP, VPN’s, VRF’s, MPLS.
• Understanding of routing, switching, Internet Protocol (IP) subnet, Network Address Translation (NAT) and security technologies.
• Demonstrated ability to engineer and modify rulesets to allow connectivity for new customer requirements.
• Demonstrated ability to read, understand, and develop schematic diagrams, technical manuals, and documentation such that the supported equipment and software can be maintained with minimal training.
• Working knowledge of Service Now or similar IT Service Management (ITSM) products.
• Superior verbal and written communication skills.
• Intermediate-level knowledge of MS Office products Word, Excel, PowerPoint, and Visio.

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:

February 10, 2026

Pay Range:

Pay Range $92,300.00 - $166,850.00

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.