Senior Network Engineer

Leidos LLC; Maryland; On-site; USD 139,000 - 251,000; Full time

Benefits offered by this job

Paid Time Off

401(k) with company match

Employee Stock Purchase Plan

Education and training support

Parental leave

Health and wellness benefits

Job summary

Leidos is seeking a Senior Network Engineer to design, deploy, and optimize secure mission networks in a secure on-site environment. You will work across architecture, deployment, operations, and sustainment, ensuring high performance and security for critical national-security missions.

The role requires 15+ years in network engineering, active TS/SCI clearance with poly, and CCNP or equivalent certification. Strong skills in BGP, IPsec, NAT, and network monitoring are essential.

Qualifications

• 15+ years experience as Network Engineer on major programs.
• Bachelor’s degree in a technical discipline; 5 years may substitute.
• Active TS/SCI clearance with Polygraph required.
• CCNP or equivalent cert required or approved.
• Experience designing, configuring, testing, and optimizing complex networks.
• Experience with enterprise security infrastructure and WAN technologies.

Responsibilities

• Design, build, test, and deploy secure mission networks.
• Configure and optimize routers, firewalls, NAT, VPNs, and IDS.
• Lead investigations of network incidents and performance issues.
• Provide technical leadership to junior and mid-level engineers.
• Maintain network diagrams and configuration documentation.

Skills

Network engineering

CCNP

TS/SCI clearance w/ Poly

Routing & switching

BGP

IPsec & NAT

VoIP/VTC

Education

Bachelors in technical field

Tools

Cisco IOS

Job description

Job Description Job Description Network Engineer (NE) Leidos – Cyber & Analytics Business Area, Key Management & Analytics Division, Your Experience. A Critical Mission. Real Impact.

Leidos has an exciting opportunity for an experienced Network Engineer to join our Cyber & Analytics Business Area, Key Management & Analytics Division, supporting critical national-security missions. This is an opportunity to apply deep network engineering expertise to complex, mission-critical environments—from designing and optimizing secure networks to deploying communications capabilities, troubleshooting complex problems, integrating emerging technologies, and guiding other network engineers. You'll work alongside systems engineers, cybersecurity professionals, technical teams, and mission partners to ensure network and telecommunications capabilities are secure, resilient, optimized, and ready to perform when the mission demands it.

This is a full-time, on-site position in a secure mission environment. Due to the nature of the work and security requirements, remote work is not available for this position. If you're an experienced network engineer who enjoys solving difficult technical problems and wants to see your expertise translate directly into mission capability, we'd like to talk.

What You'll Do

As a Senior Network Engineer, you'll provide senior-level engineering expertise across the network and telecommunications lifecycle—from architecture and design through integration, deployment, operations, optimization, and sustainment. Design, Engineer & Deploy Mission Networks - Design, build, integrate, test, document, and deploy secure network and telecommunications solutions supporting complex mission requirements. Engineer solutions incorporating routing protocols, BGP, policy-based routing, traffic shaping, tunneling, IPsec, NAT, firewall contexts, load balancing, WAN acceleration, and network monitoring, while integrating new technologies as mission needs evolve. Operate, Secure & Optimize Network Infrastructure - Configure, install, maintain, and optimize network and telecommunications infrastructure, including routers, firewalls, intrusion detection systems, cryptographic devices, VoIP, VTC, POTS, and VSAT satellite communications systems. Monitor accredited environments, analyze traffic and TCP performance, minimize latency, maximize throughput, and help ensure the required security and operational posture is maintained. Troubleshoot Complex Network & Telecommunications Challenges - Lead investigation, diagnostics, and resolution of complex network incidents and performance issues. Analyze system logs, traffic characteristics, connectivity, transmission speeds, packet behavior, and throughput; identify root causes and develop, test, document, and implement solutions and workarounds. Assess and apply patches, updates, configuration changes, backup procedures, and corrective actions using approved methods and procedures. Provide Technical Leadership & Mission Integration - Partner with systems engineers, cybersecurity professionals, external Network Operations Centers (NOCs), telecommunications providers, and cross-organizational teams to translate mission requirements into effective technical solutions. Maintain network diagrams and configuration documentation, support Certification and Accreditation (C&A) requirements, and provide technical leadership and guidance to Level 0–2 Network Engineers, validating their work and ensuring approved engineering methods and procedures are followed.

What You'll Bring

• Fifteen (15) years of experience as a Network Engineer on programs and contracts of similar scope, type, and complexity.
• Bachelor's degree in a technical discipline from an accredited college or university. Five (5) years of experience in Network Engineering disciplines may be substituted for the bachelor's degree.
• Active TS/SCI clearance with Polygraph and ability to work full-time on site in a secure mission environment.
• Current Cisco Certified Network Professional (CCNP) certification in an applicable networking discipline, or an equivalent certification approved by the program.
• Demonstrated experience designing, configuring, implementing, troubleshooting, and optimizing complex network and telecommunications environments, including routing protocols, BGP, policy-based routing, tunneling, IPsec, NAT, WAN technologies, traffic management, and network performance analysis.
• Experience configuring, testing, installing, troubleshooting, and maintaining enterprise network and security infrastructure, including routers, firewalls, intrusion detection systems, cryptographic devices, and related network technologies.
• Demonstrated ability to diagnose and resolve complex network and telecommunications problems, develop and document technical solutions, and provide technical guidance and leadership to junior and mid-level Network Engineers.

Preferred Qualifications

• Hands‑on experience configuring, administering, troubleshooting, and optimizing Palo Alto Networks firewalls, including security policies, NAT, routing, logging, and traffic analysis.
• Experience with VoIP, Video Teleconferencing (VTC), POTS, and/or VSAT TDMA IP‑based satellite communications systems.
• Experience performing advanced TCP/IP and network performance analysis, including troubleshooting latency, throughput, packet flow, and end‑to‑end network performance.
• Experience supporting accredited network environments, including configuration management, security compliance, and Certification and Accreditation (C&A) activities.
• Experience introducing, evaluating, and integrating new network and telecommunications technologies into complex operational environments.

Why Leidos?

At Leidos, you'll work alongside talented technical and mission professionals solving complex challenges where cybersecurity is fundamental to mission success. You'll have opportunities to continue developing your expertise while contributing to consequential national‑security work and connecting with the breadth of technical capabilities and career opportunities across Leidos. Eligible employees have access to a competitive benefits package that includes:

• Paid Time Off 11 paid holidays
• 401(k) with a 6% company match and immediate vesting
• Employee Stock Purchase Plan
• Technical upskilling and professional‑development opportunities
• Education and training support
• Paid parental leave
• Additional health, wellness, and employee benefits

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

Original Posting: September 25, 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: Pay Range $139,100.00 - $251,450.00 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

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. Employment benefits include 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.