Mid-Sr. Network Engineer TS/SCI Poly

Leidos LLC; Maryland; On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

Competitive benefits

Job summary

Leidos is seeking a Mid/Senior Network Engineer to join a fast-paced, SAFe-based program. You will support the LAN/WAN architecture, manage security scanning, and contribute to network documentation and new capability deployments.

The role requires substantial Cisco and Palo Alto experience and TS/SCI with Polygraph clearance. You will work on an agile team, handle incident resolution, and travel as needed.

Qualifications

• Bachelor’s degree in engineering or related field; 8+ years of related experience.
• 5+ years of hands-on Cisco hardware/software experience.
• 5+ years of hands-on Palo Alto hardware/software experience.
• Experience diagnosing, root-cause analysis, and troubleshooting routers, switches, firewalls.
• Deep understanding of IP subnetting, VLANs and OSI layers.
• Experience with multiple vendor networking products (switches, routers, firewalls).
• Able to respond to operational issues off-hours; on-call; some travel.

Responsibilities

• Create and maintain network documentation for incident resolution.
• Provide enterprise network support with IT service provider teams; align with LAN/WAN architecture.
• Manage information assurance vulnerability alerts (IAVAs) and system security scanning per System Security Plans.
• Propose, design, test, and install new capabilities; oversee technical data like rack elevations and installation instructions.

Skills

Cisco Systems

Palo Alto Systems

Network troubleshooting

IP subnetting

VLANs

Multi-vendor gear

TS/SCI with Polygraph

Education

Bachelor’s degree in engineering or related field

Tools

SolarWinds

VMware 7+

KG-175 / KG-250

VINE/GEM One

Cisco Call Manager

Jabber/Unity

Job description

Job Summary

Mid/Sr Network Engineer Leidos has a new and exciting opportunity for a Mid/Sr Network Engineer in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

Leidos is looking for a Mid-Senior Level Network Engineer to join a highly performing agile team using the Scaled Agile Framework (SAFe) methodology to support a large, complex, fast-paced program. Program execution follows DEVOPS best practices and employs robust development, test and production environments. We are using Behavior Driven Development (BDD) and test automation tools alongside a full suite of team collaboration tools in providing system engineering, development, test, integration and operational support for a program that is injecting new technology and adding advanced capabilities, while continuing to support an on-going mission and operational system.

Responsibilities

• The selected candidate will participate in the creation and ongoing maintenance of network documentation ensuring that clear, concise, and accurate information is readily available to assist with incident resolution.
• She/he will provide enterprise network support, working closely with the IT service provider teams to ensure customer requirements are considered and supported by the evolving LAN/WAN architecture.
• Responsibilities include executing the process for managing information assurance vulnerability alerts (IAVAs) and system security scanning for equipment suites in accordance with the System Security Plans for these systems to rapidly and accurately identify and remediate IAVAs.
• The selected candidate will propose, design, test, and install capabilities that are new to the environment, and will oversee the development and maintenance of technical data such as rack elevations, installation instructions, and other as-built designs.

Basic Qualifications

• Bachelor’s degree in engineering or a related field and at least 8 years of related experience. Additional experience may be substituted for a degree.
• Must have at least 5 years of in-depth experience with hardware/software from Cisco Systems.
• Must have at least 5 years of in-depth experience with hardware/software from Palo Alto Systems.
• Must have experience providing analysis, root cause diagnosis, and troubleshooting for routers, switches, and firewalls.
• Must have an in-depth understanding of IP subnetting, VLANs and the OSI layers.
• Must have in-depth experience with various vendor networking products (switches, routers, firewalls, etc.).
• Must have a solid understanding of different physical mediums such as copper and single mode/multimode fiber and physical connector types (RJ11, RJ45, LC, SC, ST, etc.).
• Must be able to respond to operational issues while off duty, on an on-call basis. Some travel will be required.

Clearance Required

Must have TS/SCI with Polygraph.

Preferred Qualifications

• Experience with KG-175 and/or KG-250/KG-255 configuration and deployment.
• Experience with VINE/GEM One.
• Experience with SolarWinds or other similar network monitoring applications, configuration and monitoring tools.
• Experience with VMWare 7 or higher usage and network configuration.
• Experience with any or all of the following technologies: Cisco, Nexus/ Catalyst/ ASA/ ISR/XE/ ASA/Firepower,ISE, McAfee Sidewinder, Palo Alto, Juniper, F5, IPSEC, NAT, SCP, TFTP, BGP, vPC.
• Experience with Cisco Call Manager server configuration and troubleshooting with integration of Instant Messaging (IMP), Cisco Meeting Server, Jabber and Unity Voicemail.
• Managing and upgrading the Cisco Unified Communications and Collaboration infrastructure – On Premise.
• Experience with OLT/PON.
• Experience with and a basic understanding of TCP MTU/MSS adjustments.
• Understanding of security using technologies as reverse proxies, cross domain solutions and load balancers.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you.

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Original Posting

Original Posting: August 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 $92,300.00 - $166,850.00

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.