TS/SCI w/ Poly Linux SME

Job Description We are seeking an experienced Linux Subject Matter Expert (SME) to provide advanced systems engineering and operational support for Cross Domain within a secure Defense Intelligence Agency (DIA) environment. This role is embedded with our Cross Domain Shared Services Framework (CDSSF) team and is responsible for maintaining, hardening, troubleshooting, and optimizing Linux-based systems across multiple domains and mission enclaves. The ideal candidate will have a deep understanding of Red Hat Enterprise Linux (RHEL), system hardening (STIG), cross domain security architectures, and the accreditation processes necessary to support Top Secret/Sensitive Compartmented Information (TS/SCI) systems.

Key Responsibilities:

• Lead system engineering, patching, configuration, and lifecycle maintenance of RHEL/CentOS/Oracle Linux systems supporting CDS environments.
• Implement and maintain DISA STIG-compliant baselines using automation tools (e.g., Ansible, SCAP, Puppet).
• Collaborate with CDS engineers, Information Assurance personnel, and enclave leads to meet ATO/RMF compliance.
• Troubleshoot kernel-level issues, performance bottlenecks, and cross-domain interface stability.

We are a company committed to creating diverse and inclusive environments where people can bring their full, authentic selves to work every day. We are an equal opportunity/affirmative action employer that believes everyone matters. Qualified candidates will receive consideration for employment regardless of their race, color, ethnicity, religion, sex (including pregnancy), sexual orientation, gender identity and expression, marital status, national origin, ancestry, genetic factors, age, disability, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable laws, regulations, and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application or recruiting process, please send a request to HR@insightglobal.com.

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https://insightglobal.com/workforce-privacy-policy/. Skills and Requirements

• Active TS/SCI clearance with Poly
• DoD 8570 IAT Level II or III certification (Security+ CE, CASP+, CISSP).
• 8+ years of experience administering Linux systems in a secure, mission-critical environment.
• 3+ years supporting cross-domain or multi-enclave environments (CDS, Garrison, SMART.NeXT, CDSSF).
• Advanced knowledge of RHEL 7/8/9, including system hardening and kernel-level tuning.
• Experience with automation frameworks and scripting languages (Ansible, Bash, Python).
• Familiarity with RMF/ATO processes and audit log management.
• Red Hat Certified Engineer (RHCE) or similar Linux certification.
• Familiarity with CDS guard technologies (Radiant Mercury, Data Diode, Garrison, etc.).
• Experience with hypervisors and virtual infrastructure supporting isolated environments.
• Knowledge of Zero Trust, enclave segmentation, and compartmentalized architectures.