System Administrator

Description

Leidos Innovations Center (LiNC), within our CISO and Digital Modernization Sector, is seeking a System Administrato
r to support various classified environments. The successful candidate will be responsible for maintaining, securing, and supporting complex classified information systems, as well as ensuring compliance with security protocols and regulations.

Location: All work will be performed on-site in San Diego, CA, no remote work is allowed in this role.

Clearance: To qualify, you must currently hold an active Secret clearance and be eligible for clearance to Special Access Programs.

This role includes a combination of duties to protect information, and maintain security controls, for an entire system, site, or program to reduce risk.

• Ensure programs maintain favorable standings with government regulations and maintain compliance artifacts such as vulnerability scans, STIGs, SCAP scans, and documentation.
• Install, configure, and sustain a mixture of Windows and Red Hat-based systems.
• Work under guidance of the Sr. ISSE to accomplish time-sensitive projects such as infrastructure buildouts, complex software installations, customer and sub-contractor coordination, and end‑user outreach.
• Other duties as assigned.

• Must be a U.S. Citizen with a current Active Secret security clearance to be considered along with sustained ability to be cleared to Special Access Programs and ability to obtain Top Secret security clearance.
• Bachelor’s degree with 2-4 years of experience or equivalent relevant industry‑standard certifications and experience.
• Must have a DoD 8570 IAT level II or higher certification such as CompTIA Security+.
• Experience operating in a Windows‑based domain environment to include management of workstations, Active Directory, and DNS.
• Familiarity navigating a Windows‑based operating system to include knowledge of: TCP/IP, software installations, running predefined scripts, accessing SMB shares, remote system management, NTFS permissions, and common administration tools.
• Basic knowledge of Linux‑based distributions and willingness to complete full RHCSA training within a year.
• Knowledge of change management procedures, roles, and responsibilities.
• Experience with the Risk Management Framework (RMF) and maintaining compliance artifacts such as SCAP scans, STIGs, and Nessus Vulnerability reports.

• Red Hat Certified System Administrator (RHCSA) certification.
• Cisco Certified Network Administrator (CCNA) certification.
• Experience working with virtual environments

We’re not looking for perfectly polished resumes or perfect fits. We’re looking for people who break limits, ask hard questions, and don’t wait to be told what’s next. At Leidos, we’re not following the roadmap — we’re redrawing it.

November 5, 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 $67,600.00 - $

The Leidos pay range for this job level is a general guideline onlyand 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 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit

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