Mid-Sr. Network Engineer TS/SCI Poly

Leidos; Corridor North (MD); On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

PTO / Paid Time Off

11 paid Holidays

401K with company match

Job summary

Leidos is seeking a Mid/Senior Network Engineer to join a fast-paced, agile team supporting a large, complex program. The role involves maintaining network documentation, providing enterprise LAN/WAN support, and executing vulnerability scanning per System Security Plans.

You will design and install capabilities while managing technical data such as rack elevations and installation instructions. Qualifications include a Bachelor’s in engineering or related field, 8+ years experience, 5+ years

Qualifications

• Bachelor’s degree in engineering or a related field; 8+ years of related experience
• 5+ years of in-depth experience with Cisco Systems hardware/software
• 5+ years of in-depth experience with Palo Alto Systems hardware/software
• Experience with routers, switches, and firewalls troubleshooting
• Deep understanding of IP subnetting, VLANs and OSI layers
• Experience with multiple vendor networking products (switches, routers, firewalls)
• Strong knowledge of copper and fiber media and connectors (RJ11, RJ45, LC, SC, ST)
• Ability to respond to operational issues while on-call
• Some travel will be required
• Clearance Required: TS/SCI with Polygraph

Responsibilities

• Maintain network documentation for incident resolution
• Provide enterprise network support with LAN/WAN architecture
• Manage IAVA processing and system security scanning per SSPL
• Propose, design, test, and install new capabilities
• Oversee development and maintenance of technical data (rack elevations, installation instructions)

Skills

Cisco

Palo Alto Networks

Networking fundamentals

IP subnetting/VLANs

Routers/Switches/Firewalls

On-call responsiveness

Education

Bachelor's degree in engineering or related field

Tools

SolarWinds

VMware 7+

KG-175 / KG-250

VINE/GEM One

Cisco Call Manager

Job description

Description

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!

Job Summary

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.

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

The Leidos pay range for this job level is a general guideline onlyand 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.

About 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

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 at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [e-mail].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

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.