Tenable Administrator (Level 3)

G2IT, LLC.; Suitland (MD); On-site; USD 110,000 - 150,000; Full time

Job summary

G2IT, LLC. is seeking an experienced Tenable Administrator (Level 3) to support enterprise vulnerability management and cybersecurity operations within a DoD environment.

The role requires hands-on work with Tenable SecurityCenter, Nessus, RHEL, and related scanning solutions. Responsibilities include configuring and maintaining scans, hardening Linux with STIGs, and supporting cloud and virtualization platforms (VMware, AWS, Azure).

Qualifications

• Active TS clearance required with eligibility for TS/SCI access.
• 5–7 years in information systems focusing on application administration.
• 3–5 years installing and administering Tenable SecurityCenter, Nessus, and related components.
• 3–5 years managing recurring scans using Tenable.
• 3–5 years of administration in RHEL environments.
• Expertise deploying Tenable SecurityCenter in an enterprise environment.
• Strong experience with RHEL and multiple releases.
• Developing, testing, and deploying enterprise scan policies.
• Experience hardening Linux using STIGs.
• Familiarity with VMware and cloud environments (AWS/Azure).
• Knowledge of PKI and secure communications.
• Excellent written and verbal communication skills.

Responsibilities

• Install, configure, administer, maintain, and troubleshoot Tenable SecurityCenter and Nessus environments.
• Develop and deploy enterprise vulnerability, compliance, and discovery scan policies.
• Schedule and maintain recurring vulnerability and compliance scans.
• Administer applications within RHEL environments.
• Develop and troubleshoot Linux shell scripts for admin tasks.
• Monitor and optimize Tenable infrastructure for availability and security.
• Support vulnerability identification, assessment, reporting, and remediation.
• Apply STIGs to harden Linux systems.
• Support servers in VMware, AWS, Azure, and other clouds.
• Support PKI requirements and secure system communications.
• Troubleshoot Tenable, Nessus, Linux, network, and app issues.
• Maintain technical docs and scan policies and records.
• Communicate findings effectively to teams and leadership.

Skills

TS/SCI eligibility

Active TS clearance

Tenable SecurityCenter

Nessus Scanner

RHEL administration

VMware/AWS/Azure

PKI

Shell scripting

STIGs hardening

Strong communication

Education

Linux OS Administrator Certification

Tools

Tenable SecurityCenter

Nessus Scanner

RHEL

VMware

AWS

Azure

Job description

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.