Jr. System Administrator

Leidos; O’Fallon (MO); On-site; USD 51,000 - 92,000; Full time

Job summary

Leidos is seeking a Junior System Administrator to support DISA—its GSM-O contract at Scott AFB, IL. The role includes protecting DISA information and operating multi-user computer systems to ensure mission readiness.

The position requires a BA degree or equivalent experience, 1 year in a customer service environment, and the ability to obtain an Interim SECRET clearance; DoD 8750 certification (Security+) within 6 months of start; and readiness for on-call/weekend support when needed.

Qualifications

• BA Degree or experience in lieu accepted.
• 1 year of experience in customer service environment.
• Must be able to gain an Interim SECRET security clearance prior to start.
• Complete DoD 8750 certification (e.g., Security+) within 6 months of start.

Responsibilities

• Maintain smooth operation of multi-user computer systems and coordinate with customers.
• 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.
• Interact with users and evaluate vendor products.
• Create, maintain, and implement detailed documentation and SOPs.
• Provide support on a Mon-Fri business hours schedule and be on-call/weekend as required by mission or emergencies.
• System monitoring using installed tools as well as external tools.

Skills

Scripting languages

Education

BA Degree

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 be able to gain an INTERIM 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:

August 27, 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 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.