Sr. Network Engineer TS / SCI Poly

Description

Leidos has a new and exciting opportunity for a Sr. Network Engineer in our National Security Sector's (NSS) 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 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 Test Driven Development (TDD) 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

Requires BS degree and 12 - 15 years of prior relevant experience or Masters with 10 - 13 years of prior relevant experience. May possess a Doctorate in technical domain.

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 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 TCP MTU / MSS adjustments and a basic understanding.

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 - apply today.

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting : October 21, 2025

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 $112,450.00 - $203,275.00

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.