Linux SME Location: Bethesda, MD, US Job ID: ATR 17586 Job Description Job Title: Linux SME Location: Bethesda, MD, ICC-B – Onsite, SCIF Environment Eligibility: TS/SCI with CI Polygraph (Full Scope Poly preferred) Contract Type: Contingent Upon Award, this will be available in the next few weeks. Job Description: We are seeking an experienced Linux Subject Matter Expert (SME) to provide advanced systems engineering and operational support for Dedicated Cross Domain Infrastructure within a secure Defense Intelligence Agency (DIA) environment. This role is embedded with our Cross Domain Solutions (CDS) 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 ofRed Hat Enterprise Linux (RHEL),system hardening(STIG), cross domainsecurity architectures, and theaccreditation processesnecessary to support Top Secret/Sensitive Compartmented Information (TS/SCI) systems. Key Responsibilities: - Lead system engineering, patching, configuration, and lifecycle maintenance of RHEL/CentOS/OracleLinux systemssupporting CDS environments. - Implement and maintain DISA STIG-compliant baselines using automationtools (e.g.,Ansible,SCAP,Puppet). - Collaborate with CDS engineers, Information Assurance personnel, and enclave leads to meetATO/RMF compliance. - Troubleshoot kernel-level issues, performance bottlenecks, and cross-domain interface stability. - Provide SME-level support for SE Linux, LDAP/Kerberos, and auditing solutions (e.g., syslog, Splunk forwarders). - Manage OS provisioning, virtual infrastructure (e.g., VMware or KVM), and baseline image creation for cross-domain enclaves. - Assist with developing and maintaining infrastructure-as-code configurations and custom scripts (Bash, Python). - Serve as Tier III escalation for complex OS issues affecting CDS reliability or availability. - Support enclave isolation and guard-side interface requirements under strict security policies. - Document engineering decisions, operational procedures, and system configurations for cross-team knowledge sharing and accreditation packages. Required Qualifications: - U.S. Citizen with activeTS/SCI clearance and CI Polygraph(or ability to obtain). -8+ years of experience administering Linux systemsin a secure, mission-critical environment. - 3+ years supporting cross-domain or multi-enclave environments (CDS, Garrison, SMART.NeXT, CDSSF). - Advanced knowledge ofRHEL 7/8/9, includingsystem hardeningand kernel-level tuning. - Experience withautomation frameworksandscripting languages (Ansible, Bash, Python). - Familiarity withRMF/ATO processesandaudit log management. - Strong understanding ofnetworking(TCP/IP, firewalls, VLANs, DNS) as it relates toLinux systems. Desired Qualifications: - DoD 8570 IAT Level II or III certification (Security+ CE, CASP+, CISSP). -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. 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