Sr. Network Administrator

Ready to put your networking expertise to work where it matters most? At Leidos, you’ll join a collaborative team of innovators supporting a mission-critical Intelligence Community customer, where every connection you build strengthens national security. The Maru Program is looking for a Senior Network Administrator who thrives in fast-paced Agile environments, enjoys solving complex technical challenges, and is passionate about delivering resilient, secure, and high-performing network solutions.

In this role, you'll work alongside talented engineers, architects, cybersecurity professionals, and software developers to modernize enterprise infrastructure, implement emerging technologies, and ensure mission systems remain secure, available, and ready for whatever comes next.

What You'll Do

As a Senior Network Administrator, you'll serve as a technical leader responsible for the administration, optimization, and security of enterprise network infrastructure supporting mission-critical operations.

Please note Gaithersburg, MD is the program’s primary work location.

Clearance Level Required:

Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Primary Responsibilities:

• Design, configure, administer, and maintain complex enterprise LAN, WAN, WLAN, VPN, and data center network environments.
• Install, configure, and support Cisco routers, switches, firewalls, load balancers, and other network infrastructure components.
• Collaborate with Agile Scrum teams to deliver infrastructure enhancements supporting continuous integration and rapid capability delivery.
• Participate in sprint planning, backlog refinement, daily stand-ups, reviews, and retrospectives as the networking subject matter expert.
• Monitor network performance, capacity, and availability while proactively identifying opportunities for optimization.
• Troubleshoot complex network issues, perform root cause analysis, and implement long-term corrective actions.
• Implement and maintain secure network architectures in accordance with Intelligence Community security requirements and best practices.
• Support cloud connectivity, hybrid networking, and infrastructure modernization initiatives.
• Develop and maintain network documentation, topology diagrams, standard operating procedures, and configuration baselines.
• Coordinate hardware refreshes, software upgrades, maintenance windows, and patch management activities.
• Partner with cybersecurity teams to address vulnerabilities, implement security controls, and support audits and accreditation activities.

Required Qualifications:

• US citizenship is required per contract.
• Bachelor's degree in Computer Science, Engineering, Information Technology or related field and 8-12 years of prior relevant experience or Master’s with 6-10 years of prior relevant experience.
• 8+ years of network administration experience.
• CompTIA Security+, and Cisco Certified Network Associate (CCNA) or Network Professional (CCNP),  or equivalent certification.
• Experience supporting large-scale, mission-critical network environments.
• Strong expertise with Cisco routing and switching technologies.
• Thorough understanding of:
  • TCP/IP
  • OSPF, BGP, EIGRP
  • VLANs
  • DNS/DHCP
  • VPN technologies
  • NAT
  • QoS
  • Multicast
• Experience administering enterprise firewalls such as Cisco ASA, Palo Alto, or Fortinet.
• Experience with network monitoring and performance management tools.
• Strong troubleshooting, analytical, and problem-solving skills.
• Excellent communication skills and the ability to collaborate across technical disciplines.
• Experience working in Agile or Scrum environments.

Preferred Qualifications:

• Cisco CCNP, CCIE, or equivalent certification.
• CompTIA Security+ CE (or DoD 8570/8140 compliant certification).
• Experience supporting Intelligence Community or Department of Defense customers.
• Experience with AWS, Azure, or hybrid cloud networking.
• Knowledge of Software Defined Networking (SDN).
• Experience with network automation using Python, Ansible, or PowerShell.
• Familiarity with Zero Trust Architecture and micro-segmentation.
• Experience with DevSecOps and Infrastructure as Code (IaC).
• Experience with VMware NSX or Cisco ACI.
• ITIL Foundation certification.

#Maru

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:

August 6, 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.