Senior Network Engineer

Leidos; Orlando (FL); On-site; USD 92,000 - 167,000; Full time

Benefits offered by this job

Paid Time Off

11 paid Holidays

401K with 6% company match

Flexible schedules

Discounted Stock Purchase Plans

Technical Upskilling

Education and Training Support

Parental Paid Leave

Job summary

Leidos is seeking a Senior Network Engineer to lead network design and implementation for a Cyber/Intel program. You will focus on architecture, routing, switching, virtualization, load balancing, security, and performance tuning across on‑prem, cloud, and virtualized environments.

You will collaborate with system, security, cloud, and application teams and support cyber training environments, including Red Team/Blue Team scenarios. This role requires TS/SCI and relevant DoD certifications.

Qualifications

• Bachelor’s degree in IT/CS/Engineering with 8+ years’ relevant experience.
• Strong Cisco switching, routing, and WAN/LAN expertise.
• Hands-on with BGP, OSPF, route maps, and enterprise routing design.
• Experience with VMware NSX, F5 load balancers, and network virtualization.
• Experience with Linux and Windows network administration.
• Security clearance: Top Secret/SCI active.
• DoD 8570 IAT II/III certification or ability to obtain within 6 months.

Responsibilities

• Design, configure, maintain, and troubleshoot enterprise network infrastructure.
• Support Cisco routing and switching across LAN/WAN.
• Configure and manage NSX and other virtualization tech.
• Troubleshoot TCP/IP, DNS, DHCP, HTTP/HTTPS, SSL/TLS, SMTP.
• Document network designs and procedures.
• Collaborate with stakeholders and cross-functional teams.

Skills

Cisco switching

Cisco routing

WAN/LAN technologies

BGP

OSPF

Route maps

STP

Routing policies

TCP/IP

Subnetting

VLANs

VPC networking

NAT

DNS

DHCP

HTTP/HTTPS

SSL/TLS

SMTP

VMware NSX

F5 load balancers

Linux administration

Windows administration

Network security controls

ACLs

Segmentation

Independent work

Team coordination

Education

Bachelor’s degree in IT/CS/Engineering

Tools

VMware NSX

F5 load balancers

Cisco ASA/Firepower

Palo Alto

Job description

Description

Leidos has a new and exciting opportunity for a Senior Network Engineer in our Intel Sector. 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:

Join our team supporting a cutting-edge Cyber program and make an impact by guiding the definition, implementation, and delivery of capability focused on Cyber Training systems. As a key player on our team, you will focus on network architecture, routing, switching, virtualization, load balancing, security, and performance-tuning across on-prem, cloud, and virtualized infrastructure. Don't miss the opportunity to take your career to the next level and be part of an innovative and dynamic environment.

Job Responsibilities:

• Design, configure, maintain, and troubleshoot enterprise network infrastructure supporting mission and training environments.
• Support Cisco routing and switching across LAN/WAN environments.
• Configure and manage network virtualization technologies, including VMware NSX.
• Support routing protocols including BGP, OSPF, route maps, redistribution, and related routing policies.
• Configure and troubleshoot F5 load balancing, including VIPs, pools, health monitors, SSL profiles, and traffic management.
• Troubleshoot complex network issues involving TCP/IP, DNS, DHCP, HTTP/HTTPS, SSL/TLS, SMTP, and related protocols.
• Support network performance tuning, capacity planning, and availability improvements.
• Work with system, security, cloud, and application teams to support infrastructure requirements.
• Support cyber training and simulation environments, including Red Team / Blue Team training scenarios and realistic cyber terrain reconstruction.
• Assist with infrastructure management across on-prem servers, virtual environments, and cloud-hosted services.
• Support network access control lists, firewall rules, segmentation, and secure connectivity requirements.
• Document network designs, configurations, troubleshooting steps, and operational procedures.
• Work directly with stakeholders, users, engineers, developers, vendors, and customer teams on technical requirements and issue resolution.

Basic Qualifications:

• Bachelor’s degree in information technology, Computer Science, Engineering, or a related field, with 8+ years of relevant experience. Additional experience may be considered in lieu of a degree.
• Strong experience with Cisco switching, routing, and WAN/LAN technologies.
• Hands-on experience with BGP, OSPF, route maps, STP, routing policies, and enterprise routing design.
• Strong understanding of TCP/IP networking, subnetting, VLANs, VPC networking, routing, NAT, DNS, DHCP, HTTP/HTTPS, SSL/TLS, and SMTP.
• Experience with VMware NSX or similar network virtualization platforms.
• Experience configuring, managing, or troubleshooting F5 load balancers.
• Experience with network hardware design, configuration, troubleshooting, and performance tuning.
• Experience with Linux and Windows network administration.
• Experience with network security controls, ACLs, segmentation, and secure network design.
• Ability to troubleshoot complex issues across network, virtualization, server, and application layers.
• Ability to work independently in a fast-paced environment while coordinating technical teams and customers.
• Ability to manage and prioritize multiple tasks and stakeholder requirements.

• Security Clearance requirement: Active Top Secret/SCI required to be considered for this role.
• Certification Requirement: Current DoD 8570 IAT Level II/III Certification, such as Security+, CCNA, CISSP or equivalent or the ability to obtain within 6 months of start.

Preferred Qualifications:

• Experience supporting PCTE, cyber range, cyber training, or mission rehearsal environments.
• Experience with F5, Cisco ASA/Firepower, Palo Alto, or other firewall technologies.
• Experience with automation tools such as Ansible or Python for network configuration and management.
• Experience with DNS servers, mail exchange records, name records, and related troubleshooting.
• Experience with cloud environments such as AWS or Azure.
• Experience with Red Hat Identity Management, LDAP, Active Directory, Single Sign-On, or related identity services.
• Familiarity with DISA STIGs, DoD security requirements, and RMF processes.
• Strong written and verbal communication skills with the ability to work with customers, leadership, and technical teams.
• Four or more years of experience supporting cyber training, cyber operations, or cyber defense environments.

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 –

Careers.leidos.com

CONMD

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:

September 8, 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 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.