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.

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.

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.

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.

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