Sr. Network Implementation Engineer

Leidos LLC; Chantilly (VA); On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

Health and Wellness programs

Income Protection

Paid Leave and Retirement

Job summary

Leidos is seeking a Sr. Network Implementation Engineer to design, test, and implement computer data communications systems. Responsibilities include documenting designs, scheduling migrations, and supporting fault isolation across enterprise networks.

The role emphasizes secure designs with DISA STIGs, ATO attainment, and collaboration with Operations to resolve incidents and improve network solutions. TS/SCI with Poly is required for the position.

Qualifications

• Experience in network engineering including Tier III+ network operations and design.
• Hands-on routing protocols experience (OSPF, BGP) in production networks.
• Experience with switching, VLANs, 802.1q, and port-channels.

Responsibilities

• Interpret customer requirements and apply standard design approaches for service delivery.
• Fully document designs with diagrams, BOMs, cabling sheets, configurations, and other supporting documents.
• Schedule maintenance windows to migrate user connections with minimal data-flow impact.
• Provide technical expertise to Operations for fault isolation and resolution.
• Develop secure network designs aligned with DISA STIGs and enterprise policies.
• Obtain Authority to Operate (ATO) for new devices and software.
• Supervise (not manage) other network support specialists to plan and implement services.
• Develop and improve design products, processes, and systems for the team.
• Serve as escalation point for enterprise outage incidents.

Skills

Network engineering

BGP

CCNP/JNCIP knowledge

Tools

Cisco equipment

Juniper equipment

Job description

The Digital Modernization Sector at Leidos has an opening for a Sr. Network Implementation Engineer to support computer data communications systems, in providing design specifications, testing and inspections for computer networks; plan and implementing upgrades; as well as, analyzing and organizing corresponding hardware and software combined solutions through network modeling.

The job duties are as follows:

• Interpret customer requirements and apply standard design approaches for service delivery.
• Fully document designs with diagrams, bill of materials, cabling sheets, configurations, and other supporting documents.
• Schedule maintenance windows for migrating user connections from legacy to the modern infrastructure transition services with little to no impact on critical data flows.
• Provide technical expertise to Operations engineers and technicians, supporting fault isolation and resolution.
• Solve tough problems with innovative and scalable solutions.
• Develop secure network designs including configurations that align with Defense Information Security Agency (DISA) Security Technical Implementation Guides (STIGs) and enterprise policies.
• Obtain Authority to Operate (ATO) for new devices, software, and capabilities.
• Supervise (not manage) other network support specialists to plan, coordinate, and implement network services.
• Develop and improve design products, processes, and systems for our team to work efficiently and effectively.
• Escalation point for incident management enterprise level outages which involves troubleshooting across multiple enterprise segments and teams.

Basic Requirements

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 Must be compliant with DoD 8140 Information Assurance Technical (IAT) Level 2. Experience specific to network engineering to include Tier III or higher network operations and/or network design and implementation. Prior responsibility for production network hardware configurations for Cisco, Brocade, and/or Juniper. Hands-on experience implementing and troubleshooting standard routing protocols in a production network, such as Open Shortest Path First (OSPF) or Border Gateway Protocol (BGP) Hands-on experience implementing and troubleshooting standard switching and trunking protocols in a production network, such as Virtual Local Area Networks (VLANs), 802.1q, and port-channels.

Desired Qualifications

• Network engineering and design experience specific to CAN/LAN. Experience should include application of industry standards, developing configurations, and integration of solutions into production environments.
• Network engineering and design experience with MPLS WANs, network management tools, and firewalls.
• Expert knowledge of routing and switching protocols and the ability to demonstrate knowledge through briefings and documentation.
• Extensive BGP experience a plus.
• Cisco Certified Network Professional (CCNP) or Juniper Networks Certified Internet Professional - Enterprise Routing and Switching (JNCIP-ENT) equivalent knowledge.
• Initiative and disciplined to work unsupervised as part of a network engineering team.
• Experience establishing process, developing documents, and organizing repositories a plus.

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: July 24, 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.

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

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.

Pay and Benefits

• Competitive compensation
• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement

More details are available here.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.