"Alerted.org

Linux SME

Job ID: ATR 17586

Job Description

Job Title: Linux SME

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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