Tenable Administrator (Level 3)

G2IT is seeking an experienced Tenable Administrator (Level 3) to support enterprise vulnerability management and cybersecurity operations within a DoD environment. The ideal candidate will have extensive hands-on experience administering Tenable SecurityCenter, Nessus Scanner, Red Hat Enterprise Linux (RHEL), and enterprise vulnerability scanning solutions.

Key Responsibilities

• Install, configure, administer, maintain, and troubleshoot Tenable SecurityCenter and Nessus Scanner environments.


• Develop, configure, test, and deploy enterprise-level vulnerability, compliance, and discovery scan policies.


• Schedule and maintain recurring vulnerability and compliance scans using Tenable solutions.


• Administer and maintain applications within Red Hat Enterprise Linux (RHEL) environments.


• Develop and troubleshoot Linux shell scripts used for system and application administration.


• Monitor and optimize Tenable infrastructure to ensure availability, performance, and security.


• Support vulnerability identification, assessment, reporting, and remediation activities.


• Apply Security Technical Implementation Guides (STIGs) to harden Linux operating systems.


• Support servers hosted within VMware, AWS, Azure, and other virtual or cloud environments.


• Support Public Key Infrastructure (PKI) requirements and secure system communications.


• Troubleshoot Tenable, Nessus, Linux, network, and application-related issues.


• Maintain technical documentation, configuration procedures, scan policies, and system administration records.


• Communicate vulnerability findings and technical issues effectively to technical teams, leadership, and mission stakeholders.

Required Qualifications

• Must hold an active Top Secret (TS) security clearance and be eligible for TS/SCI access.


• 5–7 years of experience in information systems with a focus on application administration.


• 3–5 years of direct experience installing, maintaining, and administering Tenable SecurityCenter, Nessus Scanner, and related software components.


• 3–5 years of experience developing, configuring, and maintaining recurring discovery, compliance, and vulnerability scans using Tenable.


• 3–5 years of application administration and maintenance experience within a RHEL environment.


• Expert-level knowledge of installing and administering Tenable SecurityCenter in an enterprise environment.


• Experience developing, configuring, testing, and deploying enterprise-level scan policies.


• Strong experience with Red Hat Enterprise Linux (RHEL) and multiple RHEL OS releases.


• Experience developing and debugging Linux shell scripts.


• Experience hardening Linux systems using Security Technical Implementation Guides (STIGs).


• Working knowledge of VMware and cloud environments such as AWS and/or Azure.


• Working knowledge of Public Key Infrastructure (PKI).


• Strong troubleshooting and problem-solving skills.


• Effective written and verbal communication skills.

Certification Requirements

• Must possess at least one Linux operating system administrator certification.