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.

Key Responsibilities

• 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.

Required Qualifications

• Bachelor's degree in Computer Science, Information Technology, or a related field with a minimum of five (5) 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.

Preferred Qualifications

• 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.

Come break things (in a good way). Then build them smarter.

We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for "how it's always been done."

Original Posting:
December 30, 2025

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 $73,450.00 - $132,775.00

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.