Tier 3 O&M Network Engineer

he Digital Modernization Sector at Leidos is seeking a Sr. O&M Network Engineer various wide area networks (WANs) and local area networks (LANs). This position will provide routing and boundary protection to an enterprise level infrastructure across multiple classifications and act as subject matter experts in routing and boundary technologies across multiple vendors.

The job duties of Sr. O&M Network Engineer are as follows:

• May supervise other network support and server specialists and plan, coordinate, and implement network security measures.
• Participate in evaluation of new network technologies and makes recommendations to network architecture team regarding the integration of these technologies into the existing network. Ensures that plans for hardware and communications are adequate. Develops and implements methodologies for analysis, testing, and support of LAN and WAN networks.
• Diagnose hardware and software problems and replace defective components.
• Support operations and maintain activities and administer networks including hardware, systems software, applications software, and all configurations.
• Monitor the performance of systems and networks.
• Support routine network startup and shutdown procedures and maintain control records.
• Configure, and test hardware, networking software and operating system software.
• Prepare technical proposals for presentation to the engineering review boards for adding new technologies to the network.
• Perform a full range of upgrades in accordance with existing network architecture.
• 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.
• Utilize complex network analysis tools to identify and correct problems in the network while maintaining logs and records associated with reported problems or situations.
• 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. Monitor alarms and alerts to identify network elements causing network degradation or failure.
• Execute reporting functions and data input associated with network management.
• Monitor security posture of the network, report suspected violations to designated authority.
• Coordinate with configuration management and implementation teams.
• Perform operator-level maintenance on components for network management systems.
• 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. Plan installations, transitions, and cutovers of network components and capabilities.
• Coordinate requirements with users and suppliers.
• Organize and direct network installations on site surveys.
• 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.
• Evaluate and recommend COTS applications and methodologies that can be acquired to provide interoperable, portable, and scalable information technology solutions.

Required Qualifications:

• Required Clearance: TS/SCI with 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. Additional required qualifications include:
• Must comply with DoD 8570 Information Assurance Technical (IAT) Level 2.

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:

November 20, 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 $89,700.00 - $162,150.00

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.