[Skip to main content](#main-content) [OpenNash Jobs](https://jobs.opennash.com/) [Hiring report](/reports/hiring/) · [All Leidos jobs](https://jobs.opennash.com/companies/leidos/) · [Search jobs](/search/) Leidos · O'Fallon, IL # Jr. System Administrator O'Fallon, IL $50,700.00 - $91,650.00 Administrative Listed on Leidos’s official careers site. Posted September 25, 2026. Check that it is still open and apply there. [Apply on Leidos’s careers site →](https://leidos.wd5.myworkdayjobs.com/External/job/OFallon-IL/Jr-System-Administrator_R-00193049) [OpenNash Jobs](https://jobs.opennash.com/) / [Leidos](https://jobs.opennash.com/companies/leidos/) / Jr. System Administrator ## Job description Leidos is seeking a candidate to fill a Junior System Administration position supporting DISA's GSM-O contract at Scott AFB, IL. The System Administrator is responsible for protecting DISA’s information and information systems from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording and destruction. ### PRIMARY RESPONSIBILITIES The candidate must be able to work independently to maintain the smooth operation of a multi-user computer systems, including coordination with customer and other administrators. Communicate policies and procedures to customers Update digital systems to provide insight to ongoing efforts and tickets Monitor alarm systems Perform basic level system administrator duties. Interacts with users and evaluates vendor products. Creates, maintains, and implements detailed documentation and maintains standard operating procedures. Provides support on a M-F business hours schedule, also responsible for on-call, extended hour, and weekend support as required by mission or emergency situations. System monitoring using installed tools as well as external tools. ### BASIC QUALIFICATIONS BA Degree and less than 2 years of experience. Experience may be accepted in lieu of degree. 1 year of experience in customer service environment Must hold an active SECRET security clearance prior to start. Complete DoD 8750 certification e.g. Security+ within 6 months of start date. ### Basic Understanding of Scripting Languages PREFERRED QUALIFICATIONS Additional training, education, or certification in IT related programs Experience with a ticketing system Experience working with virtual environments. GSMO If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares. ### Original Posting September 24, 2026 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 Pay Range $50,700.00 - $91,650.00 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. ## At a glance - Posted by the employer: Sep 25, 2026 - First seen by OpenNash: Oct 11, 2026 - Last checked: Oct 18, 2026 - Listed for: 23 days - Location: O'Fallon, IL - Pay: $50,700.00 - $91,650.00[Apply on Leidos’s careers site →](https://leidos.wd5.myworkdayjobs.com/External/job/OFallon-IL/Jr-System-Administrator_R-00193049) ## More jobs at Leidos ### [Air Force Facilities Project Officer](https://jobs.opennash.com/companies/leidos/jobs/544232ce626cec5eb37d/) Hampton, VA ### [CAD Applications Administrator – Bentley ProjectWise or Autodesk Vault](https://jobs.opennash.com/companies/leidos/jobs/32470397511504d0dca0/) College Park, GA +2 more ### [Classified Area System Administrator](https://jobs.opennash.com/companies/leidos/jobs/2b68af3de6b6cc34c027/) Huntsville, AL ### [Cloud Operations Administrator](https://jobs.opennash.com/companies/leidos/jobs/53a579062ee3d4e99f0c/) ### [Combat Systems Officer (CSO)](https://jobs.opennash.com/companies/leidos/jobs/fbd7874edab361187a28/) Marysville, CA ## Similar jobs at other companies ### [System Administrator](https://jobs.opennash.com/companies/general-dynamics/jobs/cfcdcba49ac7d4716295/) General Dynamics · Fairbanks, AK, US ### [SIPRNET System Administrator](https://jobs.opennash.com/companies/general-dynamics/jobs/d28869a2f3e81a0f3cad/) General Dynamics · Dedham, MA, US ### [System Administrator](https://jobs.opennash.com/companies/booz-allen-hamilton-holding/jobs/4e399d64e4cac11c7abb/) Booz Allen Hamilton Holding · San Antonio, TX ### [Linux System Administrator](https://jobs.opennash.com/companies/bae-systems/jobs/f7b9840d699b50fbfb35/) BAE Systems · Wallops Island, Virginia, United States ### [System Administrator II](https://jobs.opennash.com/companies/bae-systems/jobs/90b84bb2d4854f1c0f43/) BAE Systems · Nashua, New Hampshire, United States OpenNash lists jobs from employers’ own careers sites and does not handle applications. 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