Description

Leidos' Corporate Information Security Office, reporting through Digital Modernization sector, is seeking a System Administrator 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 at the St Petersburg, FL office.

Clearance: Active DoD Secret clearance is required to qualify for consideration. Eligibility to be cleared to Top Secret and Special Access Programs, post hire, is also required.

Primary Responsibilities

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 RedHat-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.

Basic Qualifications

• Bachelor’s degree with 4-8 years of experience, Associate degree and 6-10 years of experience; Master's degree and 2-4 years of experience, or equivalent relevant industry-standard certifications and experience may be considered in lieu of degree.

• 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.

• 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.

Preferred Qualifications

• RedHat Certified System Administrator (RHCSA) certification.

• Cisco Certified Network Administrator (CCNA) certification

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 18, 2025

Pay Range:

Pay Range $87,100.00 - $157,450.00

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.

About 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 $16.7 billion for the fiscal year ended January 3, 2025. 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 at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

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.

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