Senior Security Systems Engineer

CACI International Inc; Austin (TX); On-site; USD 108,000 - 228,000; Full time

Job summary

CACI International Inc. is seeking a Senior Security Systems Engineer to design, implement, and maintain secure Linux-based environments. You will automate system builds with Python and Ansible, harden RHEL 8, manage IdM/FreeIPA and PKI, and contribute to virtualization and networking across ESXi and KVM.

The role involves customer interaction, backlog shaping, and periodic travel for on-site deployments, with a Secret (and potential TS/SCI) clearance in a United States context.

Qualifications

• Bachelor’s degree (or higher) in Computer Science, Computer Engineering, or a related technical field, or equivalent relevant experience.
• U.S. Citizen with a minimum of a Secret security clearance with the ability to obtain a TS/SCI clearance.
• 7+ years of systems engineering or related experience.
• Strong understanding of Unix/Linux systems, with solid experience on RHEL 8.
• Strong Python scripting and programming skills.
• Proficient with Bash/shell scripting.
• Strong experience with IdM or FreeIPA.
• Strong understanding of PKI concepts and practical implementation.
• Proficient with networking concepts.
• Basic-to-intermediate understanding of SELinux.
• Proficient with Ansible for configuration management and automation.
• Experience with virtualization platforms, including ESXi and KVM.
• Solid understanding of software design concepts, patterns, tools, and best practices.
• Basic understanding of virtualization and hypervisor configuration.

Responsibilities

• Refine and enhance existing applications to meet customer and operational requirements.
• Design, develop, and maintain automation for rapid, repeatable system builds and configuration (Ansible, Python, shell).
• Develop and maintain user and administrative documentation to satisfy contract requirements.
• Periodically travel onsite to integrate operational systems, apply updates, and support deployments.
• Profile, analyze, and optimize legacy software and the supporting system stack.
• Configure, harden, and maintain RHEL 8 systems, including SELinux policies.
• Support and extend IdM/FreeIPA and PKI infrastructure.
• Contribute to virtualization environments (ESXi and KVM) and associated networking.

Skills

Unix/Linux

Python scripting

Bash/shell scripting

IdM/FreeIPA

PKI concepts

Networking concepts

SELinux

Ansible

ESXi/KVM

Software design concepts

Education

Bachelor's degree in Computer Science/Computer Engineering or related field

Tools

ESXi

KVM

Job description

Job Title: Senior Security Systems Engineer

Job Category: Engineering

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

This position is with our Systems Integration Group. You will spend part of your time developing, debugging, and maintaining software applications while owning the full ecosystem those applications run on. This includes installation and configuration of RHEL 8 operating systems, performing cybersecurity scans and hardening (including SELinux policy work), building and maintaining utility scripts and automated build processes, and supporting the Identity Management (IdM/FreeIPA) and PKI infrastructure that underpins the environment.

You will apply strong Python and shell scripting skills to automate system builds, configuration management (Ansible), and operational tasks. You will also use your networking, virtualization (ESXi and KVM), and hardware knowledge to diagnose and resolve system issues. The role includes direct interaction with the customer to capture defect reports and enhancement requests and turn them into a prioritized backlog for future releases.

Responsibilities

• Refine and enhance existing applications to meet customer and operational requirements
• Design, develop, and maintain automation for rapid, repeatable system builds and configuration (Ansible, Python, shell)
• Develop and maintain user and administrative documentation to satisfy contract requirements
• Periodically travel onsite to integrate operational systems, apply updates, and support deployments
• Profile, analyze, and optimize legacy software and the supporting system stack
• Configure, harden, and maintain RHEL 8 systems, including SELinux policies
• Support and extend IdM/FreeIPA and PKI infrastructure
• Contribute to virtualization environments (ESXi and KVM) and associated networking

Required

Qualifications

• Bachelor’s degree (or higher) in Computer Science, Computer Engineering, or a related technical field, or equivalent relevant experience
• U.S. Citizen with a minimum of a Secret security clearance with the ability to obtain a TS/SCI clearance.
• 7+ years of systems engineering or related experience
• Strong understanding of Unix/Linux systems, with solid experience on RHEL 8
• Strong Python scripting and programming skills
• Proficient with Bash/shell scripting
• Strong experience with IdM or FreeIPA
• Strong understanding of PKI concepts and practical implementation
• Proficient with networking concepts
• Basic-to-intermediate understanding of SELinux
• Proficient with Ansible for configuration management and automation
• Experience with virtualization platforms, including ESXi and KVM
• Solid understanding of software design concepts, patterns, tools, and best practices
• Basic understanding of virtualization and hypervisor configuration

Desired

• Experience with a popular CI/CD system (GitLab Pipelines, GitHub Actions, Jenkins, CircleCI, or similar)
• Familiarity with device boot processes (BIOS, UEFI, PXE)
• Ability to code in additional languages such as Golang, TypeScript, C, or C++
• Experience with cybersecurity scanning, hardening, and secure system configuration in enclave or classified environments

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

$108,400 - 227,500 USD

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.