Senior Network Administrator

Leidos has an exciting and rewarding opportunity for a Senior Network Administrator to work at the DOE Portsmouth (Piketon, Ohio) site. The Senior Network Administrator provides advanced technical leadership in the design, implementation, optimization, and security of the organization’s enterprise network infrastructure. This role serves as a subject matter expert, leads complex troubleshooting efforts, and contributes to network architecture, standards, and long-term strategy while mentoring junior staff.

• Design, implement, and maintain scalable, secure, and highly available enterprise network architectures across on-premises and hybrid environments.
• Lead complex troubleshooting efforts for critical network incidents, outages, and performance issues.
• Serve as the technical lead for network upgrades, migrations, refreshes, and major infrastructure initiatives.
• Architect and maintain advanced network security solutions including firewalls, IDS/IPS, VPNs, segmentation, and zero-trust principles.
• Develop and enforce network standards, best practices, and operational procedures.
• Perform capacity planning, performance tuning, and risk assessments to support business growth and resiliency.
• Mentor and provide technical guidance to Network Administrators and junior IT staff.
• Partner with cybersecurity, systems, cloud, and application teams to ensure secure and reliable end-to-end solutions.
• Lead disaster recovery and business continuity planning for network infrastructure, including regular testing and documentation.
• Ensure compliance with organizational policies, security frameworks, and regulatory requirements.
• Participate in vendor evaluations, solution selection, and lifecycle management.

• Bachelor’s degree in Computer Science, Information Technology, or a related field with a minimum of two (2) years of progressive experience supporting enterprise networks, or equivalent hands-on experience.
• Must be able to obtain and maintain a DOE Q security clearance.
• Demonstrated experience designing and supporting complex, multi-site enterprise network environments.
• Advanced expertise with Cisco networking platforms, including IOS, Nexus OS, routing protocols, and switching technologies.
• Strong experience with Cisco wireless, ISE, Prime, and secure remote connectivity solutions.
• Proven ability to lead technical initiatives and act as a network subject matter expert.
• Must have DOE Ports experience to be considered.

• Advanced Cisco certifications (e.g., CCNP or higher).
• Experience in regulated or government environments.
• Familiarity with cloud networking and hybrid architectures.
• Strong documentation, communication, and stakeholder engagement skills.

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.

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.