Senior Infrastructure/System Administrator

CACI International; Sterling (VA); On-site; USD 87,000 - 182,000; Full time

Job summary

CA CI International Inc. seeks a Senior Infrastructure/System Administrator in Sterling, VA. You will design and implement cutting-edge system architectures, coordinating design, security, integration and testing across cloud and on-prem environments.

Responsibilities include maintaining scalable, automated infrastructure, ensuring secure access and CI/CD readiness, and documenting processes. Required are TS/SCI clearance, 5+ years in IT admin, and strong AWS/IaC expertise.

Qualifications

• Requires active TS/SCI clearance (willing to obtain polygraph).
• Bachelor’s degree or equivalent experience in information technology or related field.
• Minimum 5 years as IT system administrator or related role.
• Strong cloud infra: AWS services (EC2/S3/RDS/Lambda/IAM/SSM).
• Experience with IaC tools: Terraform or CloudFormation.
• CI/CD support: GitLab CI or GitHub Actions.
• Linux (RHEL/Ubuntu) and Windows Server administration; scripting in Bash/PowerShell/Python.

Responsibilities

• Support design, security and maintenance across cloud and hybrid environments.
• Act as bridge between operations and development teams; manage scalable infra.
• Ensure secure access, CI/CD tooling, and resources for build/test/deploy.
• Perform systems design, development, and integration across life cycle.
• Install, configure and maintain OS, application software, and tooling.
• Conduct modeling, simulation, and analysis to optimize performance.
• Maintain security measures including backups and redundancy.
• Prepare documentation for engineering processes and procedures.

Skills

Cloud Infrastructure:AWS core services

Hybrid Networking

Infrastructure as Code

CI/CD Platform Support

OS & Scripting

Linux system administration

Python scripting

Education

Bachelor’s degree in information technology

Tools

Terraform

AWS CloudFormation

GitLab CI

GitHub Actions

Kubernetes (EKS)

Ansible

VMware

Job description

Job Title: Senior Infrastructure/System Administrator

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Local

* * *

The Opportunity:

Are you ready to shape the future of intelligence systems? CACI is seeking a talented Senior Infrastructure/System Administrator to join our team in Sterling, VA. In this role, you’ll design cutting-edge system architectures for new and existing computer systems, coordinating all aspects of development including design, modeling, security, integration, and testing. Your expertise will be crucial in achieving project milestones and developing innovative solutions to complex engineering challenges. Join us at CACI and be part of a team that’s pushing the boundaries of technology in support of our nation’s intelligence capabilities.

Responsibilities:

• Support the design, security and maintenance across the cloud and hybrid/cloud computing environments that power our software development lifecycle.
• Act as a critical bridge between system operations and development teams, managing a robust infrastructure that spans AWS cloud services and on-premises data centers.
• Manage a highly available, scalable, and automated environments, ensuring developers have the secure access, CI/CD tools, and computing resources they need to build, test, and deploy code efficiently.
• Perform systems design, development, and integration throughout the entire system life cycle.
• Implement moderately complex infrastructure, including installing, configuring, testing, and maintaining operating systems, application software, and system management tools.
• Conduct systems modeling, simulation, and analysis to optimize performance and efficiency.
• Maintain robust security measures, including backup and redundancy strategies.
• Prepare and comprehensive documentation for processes and procedures related to engineering projects.

Qualifications:

Required:

• Active TS/SCI security clearance (Willing and able to obtain a polygraph)
• Bachelor’s degree in information technology, a relevant field or equivalent experience
• Minimum of 5 years as an IT system administrator, or related experience.
• Technical understanding of: Cloud Infrastructure: Deep expertise in AWS core services including EC2, S3, RDS, Lambda, IAM, and Systems Manager (SSM). Hybrid Networking: Proven experience configuring AWS Direct Connect, Site-to-Site VPNs, and hybrid DNS architectures. Infrastructure as Code (IaC): Hands‑on proficiency with Terraform or AWS CloudFormation to provision multi‑environment stacks. CI/CD Platform Support: Experience maintaining and scaling the infrastructure for GitLab CI or GitHub Actions. Operating Systems & Scripting: Advanced administration of Linux (RHEL/Ubuntu) and Windows Server environments, utilizing Bash, Python, or PowerShell for automation.
• Demonstrated proficiency as a Linux system administrator.
• Scripting and coding skills, particularly in Python, or similar languages.

Desired:

• Expertise in operational support and system maintenance.
• Familiarity with Containerization & Orchestration, managing native Kubernetes clusters and AWS EKS (Elastic Kubernetes Service) or native Kubernetes clusters with Ansible automation.
• Certifications (Preferred): AWS Certified SysOps Administrator
• Experience with automation and virtualization technologies (e.g., VMware, virtual networking)
  

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.

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.

The proposed salary range for this position is:

$86,600 - $181,800

CACI is anEqualOpportunity 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 otherprotectedcharacteristic.