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, 2026For 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.
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.
Skills Required
- Active TS/SCI with Polygraph
- 16 years of experience (combination of work and education per listed equivalencies)
- Compliance with DoD 8570 Information Assurance Technical (IAT) Level 2
- Experience configuring and troubleshooting Palo Alto, Cisco ASA, and Forcepoint boundary protection appliances
- Experience configuring and troubleshooting Juniper and Cisco routers and switches
- Experience with protocols: OSPF, BGP, VPNs, VRF, MPLS
- Working knowledge of boundary protection best practices
- Understanding of routing, switching, IP subnetting, and NAT
- Ability to engineer and modify firewall/rulesets for connectivity
- Ability to read, develop, and maintain schematic diagrams and technical documentation
- Working knowledge of ServiceNow or similar ITSM products
- Strong verbal and written communication skills
- Intermediate-level knowledge of MS Word, Excel, PowerPoint, and Visio
- May perform COMSEC responsibilities (up to 10%)
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
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