Sr. Network Engineer

Leidos Inc; Chantilly (VA); On-site; USD 131,300 - 237,350; Full time

Job summary

Leidos Inc. in Chantilly, VA seeks an experienced Network Engineer to join a high‑standard team. The role focuses on installing, configuring, and troubleshooting network appliances, monitoring LAN/WAN, and collaborating with the Chief Engineer to optimize performance and security.

The candidate must hold an active TS/SCI with Poly clearance, have hands‑on Cisco experience, and be willing to travel OCONUS up to 50%. OCONUS travel and cross‑time‑zone collaboration are common in this program.

Qualifications

• Master's degree with 12+ years of network engineering experience; PhD may reduce requirement.
• Active TS/SCI with Poly clearance required.
• Active CCNA certification.
• Strong OSI or TCP/IP knowledge.
• Hands-on with network monitoring, diagnostics, and analytics tools.
• Experience configuring/troubleshooting Cisco appliances and routing/switching.

Responsibilities

• Install, configure, and troubleshoot network appliances (routers, switches, firewalls).
• Monitor LAN/WAN and provide regular reporting.
• Collaborate with Chief Engineer for network optimization.
• Ensure network uptime, performance, and security.
• Document and enforce network standards.
• Manage and maintain IP addressing schema.
• Travel OCONUS as needed.
• Maintain network lab in Chantilly, VA.

Skills

Network troubleshooting

Cisco devices

TCP/IP networking

Network monitoring tools

Scripting for network devices

Clearance TS/SCI

Education

Master's degree in network engineering or related field

Doctorate in network engineering or related subject (optional/reduction)

Tools

Cisco ASA/Firepower

Juniper SRX

SolarWinds

AWS

VoIP PBX systems

Asterisk

Job description

Description

Leidos is searching for an experienced and fully cleared Network Engineer to join our team in Chantilly, VA.

The team is made up of highly technical and motivated individuals. The engineer for this role will assist in troubleshooting complex problems and implementing cutting‑edge solutions. As such, this individual must be an excellent problem solver and work well in a collaborative team environment. Candidates must have proven hands‑on experience working as a network engineer. OCONUS experience is highly desired.

50% travel to OCONUS location.

The program is made up of CONUS and OCONUS teams who regularly interact across varying time zones. As a result, the candidate must have excellent communication skills and be flexible with regards to teamwork and tasking. A demonstrated ability to perform in cross‑functional teams to achieve results in a timely manner is desired.

Primary Responsibilities

• Install, configure, and troubleshoot network appliances (routers, switches, and firewalls)
• Monitor entire network infrastructure (LAN & WAN) and provide regular reporting
• Collaborate closely with the Chief Engineer to ensure network optimization and the completion of other tasks
• Ensure network uptime, performance, and security
• Document and enforce network standards
• Manage and maintain IP addressing schema
• Travel OCONUS as needed
• Maintain network lab in Chantilly, VA

Required Skills, Experience, and Education

• Master's degree and at least 12 years minimum experience depending on education, training, skills and experience. Experience requirement may be reduced with Doctorate degree in network engineering, computer science, or related subject.
• Must possess an active and in-scope TS/SCI With Poly to be considered
• Active/current basic CCNA certification
• Solid understanding of OSI or TCP/IP model
• Hands‑on experience with network monitoring, network diagnostics, and network analytics tools
• Experience configuring/troubleshooting Cisco appliances
• Experience configuring/troubleshooting routing and switching, including routing protocols
• Experience writing scripts for Cisco switches, routers, and firewalls
• Ability to work well individually, as well as within a team environment, and always maintain professional behavior with all stakeholders.
• Ability to lift 50 lbs. and climb 30 ft.

Desired Qualifications

• CCNA/CCNP Security certification
• Experience working with Cisco ASA/Firepower and Juniper SRX appliances
• Experience implementing and troubleshooting IPSec VPN tunnels
• Deep understanding of networking protocols, i.e., IPSEC, EIGRP, OSPF, QoS
• Experience installing and troubleshooting iDirect VSATs
• Experience using Solarwinds Performance Monitor and Configuration Manager
• Experience implementing and troubleshooting AWS
• Experience implementing and troubleshooting VoIP & PBX systems
• Experience implementing and troubleshooting Asterisk

Pay Range: $131,300.00 - $237,350.00

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.