Sr. Core Network Engineer

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

Benefits offered by this job

Competitive compensation

Health and Wellness programs

Income Protection

Paid Leave and Retirement

Job summary

Leidos LLC is seeking a Senior CORE Network Engineer to support government customers’ global enterprise networks. The role includes hands-on router engineering, MPLS WAN architecture, and developing services solutions.

You will evaluate lab equipment, assist with security accreditation, and maintain technical documentation for mission-focused operations. Qualified candidates have TS/SCI with Poly, 16 years of experience (or equivalent education), and DoD 8140 IAT Level 2 compliance.

Qualifications

• Requires TS/SCI with Poly clearance.
• 16 years of experience or a combination of work history and education.
• Must be compliant with DoD 8140 IAT Level 2.

Responsibilities

• Oversee MPLS WAN overall architecture.
• Develop MPLS WAN services solution.
• Perform lab equipment evaluation, integration and testing.
• Assist with the security accreditation process.
• Develop and maintain technical documentation.
• Provide Tier-4 production troubleshooting support as needed.

Skills

MPLS WAN

Router engineering

Lab testing

Documentation

Production support

Job description

Leidos has an opening for Sr. CORE Network Engineer to support our government customers’ global enterprise networks. Network Architecture provides solutions for modernizing the network components while supporting service delivery for customer requirements in a mission-focused operational enterprise. Additionally, the candidate must have experience with hands-on router engineering and/or operation.

• Responsibility for the Multiprotocol Label Switching (MPLS) Wide Area Network (WAN) overall architecture
• Developing MPLS WAN services solution
• Performing lab equipment evaluation, integration, and testing
• Assisting with the security accreditation process
• Developing and maintaining relevant technical documentation
• On as-needed basis, the engineer will also be responsible for supporting Tier-4 production troubleshooting and developing pro-active network analysis solution for the operations team

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.

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 21, 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: 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.

Leidos 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 and Benefits

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

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. 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, 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.