Sr. Network Administrator

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.

DoD 8140/8570 Compliance: Must possess an active CompTIA Security+ (or higher baseline certification) to satisfy IAM Level I / IAT Level II requirements. Cisco Networking: Must possess an active Cisco Certified Network Associate (CCNA) or Cisco Certified Network Professional (CCNP) Enterprise 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: ITIL Certification (ITIL v3 Foundation, ITIL 4 Foundation, or higher) or an equivalent IT service management framework certification (e.g., COBIT, ISO/IEC 20000). 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. #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 7, 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 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. 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 $17.2 billion for the fiscal year ended January 2, 2026. 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 here.

Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to spam.leidos@leidos.com.

Commitment and Diversity 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.