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Systems Administrator - Senior

CACI

Company : CACI

Location : O'Fallon, IL

Posted Date : 14 October 2025

Job Type : Full Time

Category : IT Operations & Helpdesk

Occupation : Systems Administrator

Job Details

Systems Administrator - Senior

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: Secret

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Continental US

The Opportunity:

Are you ready to revolutionize financial auditability and transportation logistics? We're seeking a successful, experienced Senior Systems Administrators to join our team in implementing a cutting-edge software system that will transform how USTRANSCOM manages finances and supply chains.

If you're passionate about leveraging technology to streamline operations and enhance transparency, this is your chance to make a significant impact. Join us in building the future of financial and logistical management.

This position is contingent upon contract award.

Responsibilities:

  • Perform configuration, management, and maintenance of complex enterprise-level systems

  • Assist in developing and implement strategies to optimize system operations and resource utilization

  • Conduct comprehensive system capacity analysis and lead long-term capacity planning initiatives

  • Provide expert-level assistance to users in accessing and utilizing business systems

  • Design and implement robust system security measures and ensure compliance with IT policies and regulations troubleshooting efforts for critical system issues and develop innovative solutions

  • Create and maintain comprehensive system documentation and standard operating procedures

  • Mentor junior and intermediate team members, fostering their professional growth

  • Collaborate with other IT teams and stakeholders on strategic projects and initiatives

Qualifications:

Required:

  • Bachelor's degree in Computer Science, Information Technology, or a related field of study

  • 8-11 years of extensive experience in system administration (equivalent combination of education and experience may be considered in lieu of degree)

  • Secret security clearance, or US citizen with ability to pass T-1 background investigation upon hire

  • Expert knowledge of various operating systems (e.g., Windows Server, Linux, Unix)

  • Advanced expertise in network protocols, services, and infrastructure

  • Proven experience with virtualization technologies and cloud platforms

  • Strong proficiency in scripting and automation (e.g., PowerShell, Python, Bash)

  • Excellent problem-solving skills and ability to manage multiple high-priority tasks

  • Strong leadership and communication skills

  • Experience with IT service management frameworks (e.g., ITIL)

Desired:

  • Master's degree in relevant field of study

  • Secret security clearance

  • Advanced IT certifications (e.g., CISSP, CISM, VMware VCDX)

  • Experience with emerging technologies (e.g., containerization, serverless computing)

  • Knowledge of DevOps practices and tools

  • Familiarity with federal IT regulations and compliance requirements

________________________________________________________________________________________

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you'll be part of a high-performing group dedicated to our customer's missions and driven by a higher purpose - to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You'll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground - in your career and in our legacy.

Your potential is limitless. So is ours.

Learn more about CACI here. (

________________________________________________________________________________________

Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. Learn more here ( .

Since this position can be worked in more than one location, the range shown is the national average for the position.

The proposed salary range for this position is:

$90,300-$189,600

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.

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