Senior Network Engineer

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. Apply now!

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 – apply today!

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

Pay Range:

Pay Range $92,300.00 - $166,850.00

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