Leidos' Digital Modernization group is seeking a Senior Network Engineer to be responsible for the design, migration, implementation, enhancement, optimization, and maintenance of infrastructure in support of the Compartmented Enterprise Services Office (CESO) program.
With the CESO program, the Defense Information System Agency (DISA) is looking to transform the existing Secure Web Services (SWS) environment, which provides secure information sharing to the community, into a more mature service offering to meet the DoD and intelligence communities. As part of this task order, Leidos will manage the commercial cloud migration and disestablishment of legacy systems, fully automate the continuous development & continuous integration environment, fourth estate consolidation, professionalize services – ITIL/DevSecOps based processes, improve the customer experience 1st call resolution, and achieve development of a service catalog for Defense Working Capital Fund (DWCF) Model.
This position is in Arlington, VA 100% on-site with occasional/situational travel.
U.S. citizenship with an active TS/SCI clearance and ability to obtain a CI Poly is required.
Primary Responsibilities:
• Provide technical expertise and assist with network integration and consolidation efforts across multiple systems environments.
• Prepare and review technical implementation plans to provide integrated solutions, including actions, milestones, timelines and critical paths required for complete solutions
• Address and resolve technical problems relating to the installation and upgrade of network hardware and systems.
• Interface with customers, vendors, and other technical staff to analyze business and technical requirements (i.e. establishing new circuits).
• Develop and document technical briefings, engineering standards, standard operating procedures, technical guidance, status reports and present to senior leadership
• Participate in the development of network architecture, engineering designs, and changes.
• Assist in evaluating current and emerging technologies - conduct technical assessments and make recommendations.
• Collaborate with key partners in various technologies to de-conflict efforts, identify innovation opportunities, gain efficiency while increasing operability
• Communicate with customer(s) on matters of significant importance to the organization
• Effectively complete individual projects and tasks.
Basic Qualifications:
• BS degree and 8 – 12 years of prior relevant experience or Masters with 6 – 10 years of prior relevant experience. May possess a Doctorate in technical domain.
• Candidate must possess an active DOD TS/SCI level security clearance, and be eligible to obtain and maintain a w/CI Poly
• IAT Level II Baseline Certification (e.g. CCNA Security, CySA+, GICSP, GSEC, Security+ CE, CND, SSCP)
• Ability to translate highly technical matter to non-technical audience
• Excellent communication skills
• Technical depth in network services and architecture (WAN/LAN/virtual private network (VPN))
• Experience developing solutions and troubleshooting the following vendors and technologies:
o Cisco Switches and routers
- S2S connections
- DMVPNs
- Advanced routing - BGP
o Palo Alto Firewalls
o AWS networked design and implementations.
- Virtual Private Cloud (VPCs)
- Route 53
- Amazon Firewall Services
• Ability to make decision and escalate when needed
• In-depth experience with security domains and industry best practices; business continuity and disaster recovery, emerging technology
• Self-starter with ability to work independently or in a team environment with little to no supervision
• Knowledge in Information Technology Infrastructure Library (ITIL) Foundation
Preferred Qualifications:
• Prior experienced with DISA and DISA’s support to mission partners
• Proficient in cloud hosted networks
• Master’s degree in IT, Cybersecurity, or related field
GSMO
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:September 1, 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
- Bachelor's degree with 8–12 years of relevant experience, or master's degree with 6–10 years of relevant experience; doctorate in a technical field may also qualify
- Active Department of Defense TS/SCI security clearance
- Eligibility to obtain and maintain a CI Polygraph
- IAT Level II baseline certification, such as CCNA Security, CySA+, GICSP, GSEC, Security+ CE, CND, or SSCP
- Technical depth in WAN, LAN, VPN, network services, and network architecture
- Experience troubleshooting and developing solutions with Cisco switches and routers, S2S connections, DMVPNs, and BGP
- Experience with Palo Alto firewalls
- Experience designing and implementing AWS networks, including VPCs, Route 53, and Amazon Firewall Services
- In-depth knowledge of security domains, industry best practices, business continuity, disaster recovery, and emerging technologies
- Knowledge of ITIL Foundation
- Ability to translate technical information for non-technical audiences
- Prior DISA experience
- Proficiency in cloud-hosted networks
- Master's degree in IT, cybersecurity, or a related field
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.
