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Job #: R-00126414-OTHLOC-PL-2D2020
Location: Odenton, MD
Category: Systems Administration
Schedule (FT/PT): Full Time
Travel Required: No
Shift: Day
Remote Type: Hybrid Remote
Clearance: Secret
Referral Eligibility: Ineligible
Group: Digital Modernization

This job posting is no longer active.

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Leidos is seeking an experienced Linux System Administrator for the role of Core Infrastructure Senior Systems Administrator – Linux in support of the Defense Information Systems Agency (DISA) Unified Cyber Situational Awareness (UCSA) program in Pensacola, FL. The position is primarily responsible for the planning, development, implementation, maintenance, troubleshooting and recovery of mission critical enterprise Linux systems. Additionally, the successful candidate will also be responsible for analyzing operational requirements, implementing Public Key Infrastructure (PKI) solutions and troubleshooting PKI related issues affecting mission critical systems supporting the Department of Defense (DoD). This position must be within 50 miles of Pensacola FL, Ft Meade MD, or Columbus OH, is telework friendly, but the candidate must be able and willing to work on-site as needed. 

Primary Responsibilities

  • Manage and administer the UCSA’s Red Hat Enterprise Linux-based systems (RHEL 7 and 8), ensuring their availability, security, and optimal performance in both the VMware and cloud environments (AWS, Azure, GCP, OSP).

    • Implement and configure two-factor authentication with smart cards on RHEL 7 and 8 that connect to Active Directory, enhancing system security.

    • Apply DISA Security Technical Implementation Guides (STIGs) to RHEL systems, ensuring compliance with security standards, including access controls, user authentication, and data encryption, to safeguard the RHEL environment.

    • Gather and analyze metrics from operating systems as well as applications to assist in performance tuning and fault finding.

  • Provide training and guidance on industry best practices to a small team of junior and/or intermediate Linux administrators, mentoring their skills and professional excellence.

  • Participate in both internal and external system design consulting, platform management, and capacity planning activities.

  • Utilize Git for version control, including repository management, branching, merging, and code collaboration.

  • Design and maintain CI/CD pipelines for automating build, test, and deployment processes, ensuring efficient software delivery.

  • Implement Infrastructure-as-Code practices, using tools such as Ansible, Terraform, Chef, or Puppet, to automate and manage infrastructure deployments in the cloud and on-prem.

  • Stay current with emerging technologies and industry trends in running production systems, site reliability engineering, and suggesting and implementing recommendations for enhancements and improvements.

Basic Qualifications

  • Bachelor's degree and at least 8 years experience in Computer Science, Information Technology, or a related field (or equivalent experience) .

  • Extensive experience working as a Linux Administrator, preferably at a senior level, with a strong focus on Red Hat Enterprise Linux (RHEL 7 and 8) in both the VMware and cloud environments (AWS, Azure, GCP, OSP).

  • Strong knowledge of RHEL operating systems and their administration, including installation, configuration, and troubleshooting.

  • Proven experience in implementing two-factor authentication with smart cards on RHEL 7 and 8, connecting to Active Directory.

  • Proficiency in Git for version control, including repository management and code collaboration and experience with designing and maintaining CI/CD pipelines for automated software build, test, and deployment processes.

  • Familiarity with Infrastructure-as-Code principles and tools (e.g., Ansible, Terraform, Chef, Puppet).

  • In-depth understanding of networking concepts and protocols (TCP/IP, DNS, DHCP, VLANs) on RHEL platforms.

  • Experience in implementing and maintaining security measures in RHEL and Windows environments.

  • Excellent leadership and communication skills, with the ability to mentor and motivate team members.

  • run production Unix systems in a quantity > 10

  • Strong knowledge of the advantages and disadvantages of automation

  • SECRET Clearance

  • IAT Level II (i.e., Security+)

  • Experience with Defensive Cyber Systems and Operations

  • Experience with DISA Defensive Cyber Platforms

  • Familiarity with SAFe Agile

Original Posting Date:


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 $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 a Fortune 500® innovation company rapidly addressing the world’s most vexing challenges in national security and health. The company's global workforce of 47,000 collaborates to create smarter technology solutions for customers in heavily regulated industries. Headquartered in Reston, Virginia, Leidos reported annual revenues of approximately $15.4 billion for the fiscal year ended December 29, 2023.  For more information, visit

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 here.

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 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 [email protected].

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 Diversity

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.

This job posting is no longer active.

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