Linux System Administrator - Insider Threat - Top Secret Required

Job Description

Job Description

❗Applicants without an active TS/SCI clearance will not be considered. Please do not apply if you do not meet this requirement❗

Linux System Administrator – Insider Threat (ITD)

Clearance Required: ACTIVE TS/SCI (Non-Negotiable)
Work Location: Onsite – Secure Facility (SCIF)
Schedule: Standard Business Hours
Employment Type: Full-Time
Program: Treasury Foreign Intelligence Network (TFIN)

NON-NEGOTIABLE REQUIREMENTS (READ FIRST)

Applicants must meet ALL of the following requirements to be considered:

• Active TS/SCI clearance (current and verifiable)

• U.S. Citizenship

• Ability to work onsite full-time in a SCIF (no remote or hybrid)

• 7+ years of hands-on Linux/UNIX system administration experience

• Demonstrated experience supporting security-focused or mission-critical systems (e.g., insider threat, monitoring, cyber, or intelligence environments)

• Experience performing Linux system hardening, patching, and vulnerability remediation

❗ Applicants who do not meet all non-negotiable requirements will not be considered.

POSITION OVERVIEW

We are seeking a Senior Linux System Administrator to support a mission-critical Insider Threat Detection (ITD) environment for a federal intelligence customer. This role supports Tier III Linux systems, User Activity Monitoring (UAM) platforms, and security-centric infrastructure operating in a highly classified environment.

This position requires technical depth, operational discipline, and security awareness. It is not a junior or generalist Linux role.

KEY RESPONSIBILITIES

• Administer, configure, and maintain Linux/UNIX servers supporting Insider Threat and UAM platforms

• Provide Tier III operational support for mission systems, including advanced troubleshooting

• Perform system hardening, patching, and configuration management in accordance with federal security standards

• Monitor system performance, logs, and health; identify anomalies and potential security issues

• Support backup, recovery, and disaster recovery operations

• Deploy, maintain, and support UAM agents and backend infrastructure

• Assist with incident response, audits, investigations, and compliance activities

• Maintain system documentation, SOPs, and baseline configurations

• Collaborate with cybersecurity, network, and insider threat teams

REQUIRED TECHNICAL SKILLS

• Linux/UNIX administration (RHEL, Rocky, CentOS, or similar)

• Bash / shell scripting

• System and log monitoring

• Backup and recovery tools and processes

• Linux security hardening and patch management

• Experience supporting security monitoring, cyber, or insider threat systems

• Familiarity with STIGs, NIST 800-53, or IC/Federal security frameworks

⭐ RECOMMENDED / PREFERRED QUALIFICATIONS

(Not required; used to identify top candidates)

• Experience with User Activity Monitoring (UAM) tools

• Prior work in an Insider Threat Program (ITP)

• Experience supporting IC, Treasury, DoD, or law enforcement environments

• Familiarity with SIEM or endpoint monitoring platforms

• Certifications (recommended, not required):

  • RHCSA / RHCE

  • Security+

  • CISSP

  • GIAC (GCED, GCUX)

WHY JOIN

• Support a high-impact national security mission

• Stable, long-term federal program

• Work alongside senior technical and security professionals

• Competitive compensation aligned to clearance and experience (not publicly listed)

Company DescriptionTenacity Solutions, LLC (Tenacity) is a Service-Disabled Veteran Owned Small Business (SDVOSB) founded by our CEO, Gabriel Brown, CAPT, USN (Ret). Tenacity is an innovative company, leveraging talent, skill, and knowledge with cutting-edge and proven practices to deliver solutions and products that exceed customers’ requirements and surpasses their expectations. Tenacity immediately has become a leading technology and management solutions provider with a mission to advance healthcare services for specialized populations including Veterans and their families. Headquartered in North, Bethesda, Maryland (DMV), our talented resources are located across the United States. We bring diverse talent to design solutions that help customers with their greatest challenges.

Company Description

Tenacity Solutions, LLC (Tenacity) is a Service-Disabled Veteran Owned Small Business (SDVOSB) founded by our CEO, Gabriel Brown, CAPT, USN (Ret). Tenacity is an innovative company, leveraging talent, skill, and knowledge with cutting-edge and proven practices to deliver solutions and products that exceed customers’ requirements and surpasses their expectations. Tenacity immediately has become a leading technology and management solutions provider with a mission to advance healthcare services for specialized populations including Veterans and their families. Headquartered in North, Bethesda, Maryland (DMV), our talented resources are located across the United States. We bring diverse talent to design solutions that help customers with their greatest challenges.