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Systems Administrator Jobs in O Fallon, IL (NOW HIRING)

As a Systems Administrator you will help ensure today is safe and tomorrow is smarter. Our work depends on TS/SCI cleared Systems Administrator joining our team to Support our intelligence customer ...

JOB TITLE Systems Administrator LOCATION St. Louis, Missouri (Hybrid) HYBRID POLICY 70% On-Site 30% Work-from-Home JOB SUMMARY The Systems Administrator plays a critical role in maintaining and ...

Responsibilities As a Systems Administrator , you will provide administration, operation, maintenance, and security support for information systems supporting the Print and Media Distribution ...

Responsibilities As a Systems Administrator , you will provide administration, operation, maintenance, and security support for information systems supporting the Print and Media Distribution ...

We are seeking an IT Engineer with Microsoft Enterprise Systems Administrator Advisor experience to join our team in support of a Federal Intelligence Agency contract. In addition to receiving a ...

We are seeking an IT Engineer with Microsoft Enterprise Systems Administrator Advisor experience to join our team in support of a Federal Intelligence Agency contract. In addition to receiving a ...

We are seeking an IT Engineer with Microsoft Enterprise Systems Administrator Advisor experience to join our team in support of a Federal Intelligence Agency contract. In addition to receiving a ...

Business Systems Administrator Bloomington, IL or St. Louis, MO RoomReady is looking to add a Business Systems Administrator to our IT team. This role is responsible for supporting and administering ...

Business Systems Administrator Bloomington, IL or St. Louis, MO RoomReady is looking to add a Business Systems Administrator to our IT team. This role is responsible for supporting and administering ...

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Systems Administrator information

See O Fallon, IL salary details

$38.2K

$83K

$128.3K

How much do systems administrator jobs pay per year?

As of Aug 30, 2026, the average yearly pay for systems administrator in O'Fallon, IL is $82,952.00, according to ZipRecruiter salary data. Most workers in this role earn between $65,300.00 and $97,000.00 per year, depending on experience, location, and employer.

What is a systems administrator?

Systems Administrators, often called SysAdmins, are IT professionals responsible for managing, maintaining, and supporting computer systems and networks within an organization. Their duties include installing hardware and software, monitoring system performance, troubleshooting technical issues, and ensuring system security and data integrity. They play a key role in minimizing downtime, performing regular backups, and updating systems to keep an organization's IT infrastructure running smoothly.

What does a systems administrator do?

The primary duties of a system administrator are to install, update, and maintain computer systems while managing user access regimes. As a systems administrator, you have administrative privileges to change settings, install or remove software, and access security functions unavailable to normal users. A systems administrator might oversee multiple machines at once, or even an entire network. You provide technical support to users who are experiencing problems and collaborate with network administrators to ensure the continued performance of the network. As a systems administrator, you determine the level of access a user has to network information and what operations they can perform, limiting users to only what they need to perform their job.

What are the key skills and qualifications needed to thrive as a systems administrator, and why are they important?

To thrive as a Systems Administrator, you need a solid understanding of operating systems, network management, and security protocols, typically supported by a relevant degree or certifications like CompTIA Network+, Microsoft Certified Solutions Associate (MCSA), or Linux+. Familiarity with tools such as Active Directory, virtualization platforms, and configuration management systems is essential. Strong problem-solving abilities, attention to detail, and effective communication skills help you respond quickly to issues and work collaboratively with IT teams. These skills and qualifications are crucial for maintaining system reliability, minimizing downtime, and ensuring secure, efficient IT operations.

What are some typical challenges a systems administrator faces when managing both on-premises and cloud infrastructure?

Systems Administrators often juggle responsibilities across on-premises servers and cloud-based platforms, which can introduce challenges such as ensuring seamless integration, maintaining consistent security policies, and managing access controls. Balancing updates, backups, and monitoring tools across different environments requires strong organizational skills and up-to-date technical knowledge. Effective communication with other IT team members and end users is also crucial for troubleshooting and minimizing downtime.

What is the difference between Systems Administrator vs Network Administrator?

AspectSystems AdministratorNetwork Administrator
CertificationsCompTIA Server+, Microsoft Certified: Windows Server FundamentalsCompTIA Network+, Cisco CCNA
Work EnvironmentManage servers, operating systems, and enterprise applicationsFocus on network infrastructure, routers, switches, and connectivity
Employer & Industry UsageIT departments across various industries, supporting internal systemsOrganizations with complex networks, telecom, and internet service providers

While both roles support IT infrastructure, Systems Administrators primarily manage servers and software systems, whereas Network Administrators focus on network hardware and connectivity. Understanding these differences helps in choosing the right career path or job focus within IT.

What are the most commonly searched types of Systems Administrator jobs in O'Fallon, IL?

The most popular types of Systems Administrator jobs in O'Fallon, IL are:

What are popular job titles related to Systems Administrator jobs in O'Fallon, IL?

For Systems Administrator jobs in O'Fallon, IL, the most frequently searched job titles are:

What cities near O'Fallon, IL are hiring for Systems Administrator jobs?

Cities near O'Fallon, IL with the most Systems Administrator job openings:

Infographic showing various Systems Administrator job openings in O'Fallon, IL as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $82,952 per year, or $39.9 per hour.

Systems Administrator

Saint Louis, MO • On-site


GDIT
IT Services • 10K+ employees

7.8

Company rating: 7.8 out of 10

Based on 63 frontline employees who took The Breakroom Quiz

88th of 226 rated it services

Good employer

Recommended by students

Good training


Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 8 days ago


Job description

Type of Requisition:

Regular

Clearance Level Must Currently Possess:

Top Secret/SCI

Clearance Level Must Be Able to Obtain:

Top Secret SCI + Polygraph

Public Trust/Other Required:

None

Job Family:

IT Infrastructure and Operations

Job Qualifications:

Skills:

Computer Backups, Software Updates, Troubleshooting

Certifications:

Security + - CompTIA - CompTIA

Experience:

5 + years of related experience

US Citizenship Required:

Yes

Job Description:

Transform technology into opportunity as a Systems Administrator with GDIT. A career in enterprise IT means connecting and enhancing the systems that matter most. At GDIT you'll be at the forefront of innovation and play a meaningful part in improving how agencies operate.
At GDIT, people are our differentiator. As a Systems Administrator you will help ensure today is safe and tomorrow is smarter. Our work depends on TS/SCI cleared Systems Administrator joining our team to Support our intelligence customer in St. Louis, MO.

HOW A SYSTEMS ADMINISTRATORWILL MAKE AN IMPACT

As a System Administrator (Desktop Support), you will be responsible for providing excellent technical support to end-users, maintaining desktop systems, and ensuring the reliable operation of computer systems. You will work closely with both on-site and remote users to resolve issues, coordinate upgrades, and provide hands-on support for desktop environments.

In this role, a typical day will include:

  • Independently develops technical solution for the management for software, hardware, configurations, and architecture. Provides interpretation to Systems matters that are moderately complex in nature.
  • Provide troubleshooting support for systems hardware and software issues that are highly complex.
  • Performs advance software installations and upgrades to operating systems and layered software packages.
  • Applies advanced knowledge in monitoring and tuning the system to achieve optimum performance levels.
  • Provides guidance to less experienced personnel on workstation/server data integrity matters and the implantation of standard software and hardware solutions.
  • Leads complex data/media recoverability following a schedule of system backups and database archive operations.
  • Evaluates and assesses existing systems and plans long term strategies.
  • Configure and maintain networked computer system, including hardware, system software, and applications
  • Conducts advanced to complex hardware and software audits of workstations and servers to ensure compliance with established standards, policies and configurations guidelines.
  • Recognized subject matter expert in job area typically through advanced education and work experience. Established operational plans. Manages large projects with limited oversight form manager.
  • Strong written and verbal communication is imperative when dealing with technically minded employees and non-technical colleagues
  • Train end-users on the proper use of hardware and software. May training large groups of end users.
  • May coach and review the work of less-experienced professionals.
  • May serve as a team or task leader (Not a people manager)
  • May require after hour support or weekend support for mission, program and special project support

WHAT YOU'LL NEED TO SUCCEED:

  • Knowledge in one or more of the following areas:
    • Thin Client using Virtual Desktop Infrastructure (VDI) Technology
    • Experience and/or knowledgeable with: Windows 11; Windows 10; Citrix; SMS; and SCCM
    • End User Hardware
      • Thin Client, Thick Monitors, KVM's, Printers, Plotters Print Server Configurations, VOIP phone,
    • Desktop Image Management
    • Home Directory and Profile Support Services
    • E-mail Support Services
    • Software Support Services
    • Experience and/or knowledgeable with; Windows 7; Windows 10; Win11 Citrix; SMS; and SCCM
  • Excellent troubleshooting capabilities
  • Strong communication skills
  • Strong work ethic and attention to detail
  • Strong writing skills (consistently document work completed)
  • Strong time management skills and ability to work flexible schedules to meet job requirements
  • Ability to move and lift computers, printers, monitors, and other hardware
  • Team player and willing to share knowledge and learn from others to ensure team's success
  • Enthusiasm and ability to adapt to new and changing technologies

Education/Experience Requirement:

  • BA/BS (or equivalent experience)
  • 5+ years of experience

Certifications:

  • Security+ or CASP
  • ITIL v4 Foundations

Location: Customer Site

US Citizenship Required

GDIT IS YOUR PLACE
At GDIT, the mission is our purpose, and our people are at the center of everything we do.
Growth: AI-powered career tool that identifies career steps and learning opportunities
Support: An internal mobility team focused on helping you achieve your career goals
Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
Community: Award-winning culture of innovation and a military-friendly workplace
OWN YOUR OPPORTUNITY
Explore an enterprise IT career at GDIT and you'll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

RoverGSS

The likely salary range for this position is $97,968 - $132,250. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Scheduled Weekly Hours:

40

Travel Required:

None

Telecommuting Options:

Onsite

Work Location:

USA MO St. Louis

Additional Work Locations:

Total Rewards at GDIT:

Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process:

As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work:

We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development.Join our Talent Community to stay up to date on our career opportunities and events at

gdit.com/tc.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

General Dynamics Information Technology logo

About General Dynamics Information Technology

Sourced by ZipRecruiter

GDIT is a global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense, and intelligence community. Its 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. The company operates across 50+ countries worldwide, offering leading capabilities in digital modernization, AI/ML, cloud, cyber, and application development.

Industry

It services

Company size

10,000+ Employees

Headquarters location

Falls Church, VA, US


What General Dynamics Information Technology employees say

Pay

Benefits

Hours and flexibility

Workplace

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