Senior Infrastructure/System Administrator

CACI•Sterling, VA

About The Position

CACI is seeking a Senior Infrastructure/System Administrator in Sterling, Virginia, to design system architectures for new and existing computer systems. The role coordinates design, modeling, security, integration, and testing, and contributes to project milestones and solutions to engineering challenges in support of intelligence missions. The position supports the design, security, and maintenance of cloud and hybrid-cloud environments used in the software development lifecycle. It bridges system operations and development teams while managing AWS cloud services and on-premises data centers. The administrator maintains highly available, scalable, and automated environments that provide developers with secure access, CI/CD tools, and computing resources for building, testing, and deploying code. The role also performs systems design, development, and integration across the system life cycle; implements and maintains infrastructure, operating systems, application software, and system management tools; conducts modeling, simulation, and analysis; maintains security, backup, and redundancy measures; and documents engineering processes and procedures. An active TS/SCI clearance is required, and the candidate must be willing and able to obtain a polygraph.

Requirements

Active TS/SCI security clearance and willingness and ability to obtain a polygraph.
Bachelor’s degree in information technology or a relevant field, or equivalent experience.
At least 5 years of experience as an IT system administrator or in related work.
Deep expertise in AWS core services, including EC2, S3, RDS, Lambda, IAM, and Systems Manager (SSM).
Experience configuring AWS Direct Connect, Site-to-Site VPNs, and hybrid DNS architectures.
Hands-on proficiency with Terraform or AWS CloudFormation for provisioning multi-environment stacks.
Experience maintaining and scaling infrastructure for GitLab CI or GitHub Actions.
Advanced administration of Linux (RHEL/Ubuntu) and Windows Server environments.
Experience using Bash, Python, or PowerShell for automation.
Demonstrated proficiency as a Linux system administrator.
Scripting and coding skills, particularly in Python or similar languages.

Nice To Haves

Expertise in operational support and system maintenance.
Familiarity with containerization and orchestration, including managing native Kubernetes clusters and AWS EKS or native Kubernetes clusters with Ansible automation.
AWS Certified SysOps Administrator certification.
Experience with automation and virtualization technologies, such as VMware and virtual networking.

Responsibilities

Support the design, security, and maintenance of cloud and hybrid-cloud computing environments that support the software development lifecycle.
Bridge system operations and development teams while managing infrastructure across AWS cloud services and on-premises data centers.
Maintain highly available, scalable, and automated environments, including secure developer access, CI/CD tools, and computing resources.
Perform systems design, development, and integration throughout the 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 security measures, including backup and redundancy strategies.
Prepare comprehensive documentation for engineering project processes and procedures.