Sr Linux Systems Administrator

  • Leidos
  • O'Fallon, IL, United States
  • Jan 13, 2023
Full time

Job Description


Job Description:

Leidos is seeking a Lead - Sr. Linux Systems Administrator in support of the Defense Information Systems Agency (DISA) located at Scott AFB, IL.  

DISA acts as the provider of GIG/Defense Information System Network (DISN) services to its customers, the department of Defense (DoD), and national security organizations.  The candidate will maintain the smooth operation of multi-user computer systems on a global network management system.


  • Use advanced knowledge of Linus/Unix technical skills to perform as the technical lead for the program Linux Admin team consisting of 8-10 Linux Admins.
  • Assign daily technical responsibilities to other Linux team personnel
  • Provide technical input for Linux/Unix issues, plans, upgrades as needed.
  • Provides coaching and reviewing the work of lower-level technical staff.
  • Be able to work in a rapid paced environment and must be able to work independently.
  • Lead the onboarding and standup of new enclaves and compute environments.
  • The candidate works independently to maintain the smooth operation of a multi-user computer systems, including coordination with network administrators.
  • Duties include setting up administrator and service accounts, tuning system performance, installing system wide software.
  • Interacts with users and evaluates vendor products.
  • Makes recommendations to purchase hardware and software, coordinates installation and provides backup recovery.
  • Develops and monitors policies and standards for allocation related to the use of computing resources.
  • Creates, maintains, and implements detailed documentation and maintains standard operating procedures.
  • Application of security settings and other commercial best practices such as DISA STIGS.
  • Provides support on a M-F business hours schedule, also responsible for on-call, extended hour, and weekend support as required by mission or emergencies.


  • Bachelor's degree and 8 years of overall related experience with server environment. Specific experience, education and training may be considered in lieu of degree.
  • Extensive experience working with virtual environments using VMware
  • Shell scripting (e.g. bash) and experience in other languages like Perl, Python, and Java.
  • Application of security settings and other commercial best practices such as DISA STIGS.
  • Intrusion Detection/Prevention Systems (such as FireEye and McAfee sensors and sandboxes)
  • Security Incident Event Management (SIEM) including Splunk
  • Currently possess an active Secret security clearance with the ability to obtain a Top Secret is required for this position.
  • Currently possess DoD 8750 certification at least IAT level II, e.g. Security+ce.


  • Integration of cyber security tools and systems with network performance, trouble ticketing, and security subsystems highly desired.  
  • Experience with support systems to include enclave Ethernet switches, storage area networks (SAN), and network attached storage (NAS). 
  • Candidates with a thorough knowledge of networking principles to included TCP/IP a plus. 
  • Experience with a ticketing system such as BMC Remedy.
  • Windows Server experience.


Pay Range:

Pay Range $84,500.00 - $130,000.00 - $175,500.00

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.