The Digital Modernization Sector at Leidos is seeking a Sr. Tier III operations and maintenance (O&M) engineer to support various WAN and LAN networks. Will provide incident resolution, routing changes, firewall changes; act as subject matter expert in WAN and LAN technologies; support intra- and inter- net and other data communications systems or segments of networked system.
Description of Job Duties/Responsibilities:
Support operations and maintenance activities and administer networks including LAN and WAN technologies such as OSPF, BGP, VRF's, VLAN's, VRRP, MPLS.
Monitor the performance of systems and networks
Configure, and test hardware, networking software and operating system software
Review user requests for upgrades or additions to the network to assess impact on network performance and provide advice and guidance on the most practical technical approach to meeting user requirements
Perform long term O&M activities to include tier 3 troubleshooting and problem resolution
Prepare troubleshooting procedures for restoring the network to optimal performance levels
Provide fault management for the network and supports performance management functions
Respond, isolate, and resolve network troubles
Execute reporting functions and data input associated with network management
Coordinate with configuration management and implementation teams
Analyze network characteristics (e.g., traffic, connect time, transmission speeds, packet sizes, and throughput); recommend procurement, removals, and modifications to network components
Optimize network topologies and site configurations.
Coordinate requirements with users
Assess and document current site network configuration and user requirements
Maintain operating systems, communications software, data base packages, compilers, assemblers, and utility programs
Apply software, hardware, and standards information technology skills in the analysis, specification, development, integration, and acquisition of open systems for Information Management (IM) applications
Ensure these systems and applications are compliant with standards for open systems architectures, reference models, and profiles of standards - such as the IEEE Open Systems Environment (OSE) reference model - as they apply to the implementation and specification of IM solutions on the application platform, across the application program interface (API), and the external environment/software application
May have up to 10% COMSEC responsibilities, as needed.
Subject to be called in during afterhours for incident resolution.
Requirements
TS SCI with a 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 in configuring and troubleshooting boundary protection technologies such as Palo Alto, Cisco ASA, and Forcepoint appliances
Experience with configuring and troubleshooting Juniper and Cisco routers and switches.
Experience with protocols such as OSPF, BGP, VPN's, VRF's, MPLS.
Working knowledge of boundary protection best practices
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:
June 30, 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:
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.