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.
- 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.
- 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.
At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”
If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.
Original Posting:December 30, 2025For 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.
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.
Top Skills
What We Do
We Are Leidos
For 50 years we have been tackling some of the biggest problems that face our nation and our world.
OUR MISSION
Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
Your most important work is ahead.
