Sr. Network Design Engineer - Access

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 Senior Network Design Engineer (Access) to support WAN and LAN networks, providing design, upgrades and configuration support to the architecture team. Lead as SME in WAN/LAN technologies, ensure security alignment with DISA STIGs, and obtain ATO for new devices.

You will design MPLS architectures, document designs, and perform extensive testing and evaluation of network technologies while supporting Tier-4 production troubleshooting and proactive network analysis.

Qualifications

• Experience in designing and upgrading WAN/LAN networks.
• Ability to document designs with diagrams and BOMs.
• Familiarity with security concepts and STIGs.
• Strong troubleshooting and fault isolation skills.

Responsibilities

• Design and improve MPLS network architecture and services.
• Maintain relevant technical documentation.
• Develop secure network designs aligned with DISA STIGs and policies.
• Obtain Authority to Operate (ATO) for new devices and capabilities.
• Lab evaluation and integration with NMS and security certification.
• Evaluate new network technologies and services.
• Document designs with diagrams, BOMs, cabling sheets, configurations.

Skills

Network design

WAN/LAN expertise

Documentation

Troubleshooting

Team collaboration

Tools

Juniper JNCIA/JNCIP/JNCIE

Job description

Leidos has an opening for a Sr. Network Design Engineer (Access) to support the customer’s various WAN and LAN networks, in providing network design, upgrades and config support to the architecture team; act as subject matter expert in WAN and LAN technologies and vendors; support customer’s intra- and inter- net and other data communications systems or segments of networked system; and by Providing tiered support as required. The job duties are as follows:

Job Duties

• Design and improve overall MPLS network architecture and network services.
• Maintain relevant technical documentation.
• 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.
• Perform lab equipment, software, application, and network services solution evaluation, testing, integration with NMS, and security certification.
• Evaluate new network technologies, solution, and services.
• Interpret customer requirements and apply industry standard design approaches for service delivery.
• Fully document designs with diagrams, bill of materials, cabling sheets, configurations, ability to brief designs Provide technical expertise to Operations engineers and technicians, supporting fault isolation and resolution.
• Solve tough problems with innovative and scalable solutions.
• Configuring and troubleshooting Quality of Service (QoS) and traffic optimization to maximize bandwidth usage.
• Support Tier-4 production troubleshooting and develop pro-active network analysis solution of Operation team.
• Leverage complex network analysis tools to identify and predict problems in the network and aid in the post-mortem analysis of network anomalies.

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.
• Juniper certification or training: JNCIA, JNCIP, and JNCIE.
• Experience in developing and implementing methodologies for analysis, testing, and support of CAN/LAN and WAN networks.
• Familiar with firewalls and network timing.
• Experience with network equipment and solution rolls out, as well as engineering documentation.
• Experience with operations and maintenance activities of MPLS networks, MPLS VPN services.
• Experience using complex network analysis tools to identify and correct problems in the network while maintaining logs and records associated with reported problems or situations.
• Knowledge of routing and switching protocols and the ability to demonstrate knowledge through briefings and documentation.
• Extensive BGP experience 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.

Job Details

Original Posting: September 17, 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

$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.

Company Overview

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.

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.