> Markdown version of [/jobs/ext/2445866-security-engineer-vulnerability-management-acas-tenable-sc-secret-clearance](https://www.wearedevelopers.com/jobs/ext/2445866-security-engineer-vulnerability-management-acas-tenable-sc-secret-clearance). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Security Engineer, Vulnerability Management (ACAS/Tenable.sc) - Secret clearance

- **Company:** Leidos Holdings, Inc.
- **Location:** Oklahoma City, OK, United States
- **Experience:** Expert
- **Salary:** $130,000.0 - $160,000.0
- **Contract:** Temporary to permanent
- **Skills:** Microsoft Windows, Computing Platforms, Systems Engineering, Cloud Computing, CompTIA Security+, Linux System Administration, Software Vulnerability Management, SC Clearance, Nessus, Vulnerability Analysis
- **Published:** August 10, 2026
- **Apply:** https://www.careerjet.com/jobad/us057074ee0e5bfd246bf4855266d6ea72

## About the Role

This is a hands-on role that combines deep Tenable platform expertise with Windows/Linux administration, vulnerability analysis, system hardening, and cross-team collaboration. The ideal candidate will have experience working in a DoD or federal environment and be comfortable managing vulnerability scanning and remediation across complex enterprise environments., * 5+ years of experience in vulnerability management, information assurance, or systems security, preferably within a DoD or federal environment.

 * Hands-on experience administering Tenable.sc, Nessus, and ACAS in a DoD or federal environment.
 * Working knowledge of DoD STIGs, CKLs, and RMF processes.
 * Strong Windows and Linux administration experience.
 * Active DoD Secret clearance required; clearance must be current and verifiable.
 * DoD 8570/8140 IAT Level II baseline certification required, such as:

 * CompTIA Security+ CE
 * CySA+
 * GSEC
 * SSCP
 * CCNA-Security
 * Strong written and verbal communication skills with the ability to collaborate effectively across technical teams.

## Description

PGTEK is seeking a Security Engineer, Vulnerability Management with a Secret clearance (or higher) to administer and optimize our Tenable.sc/ACAS environment, drive vulnerability remediation across enterprise systems, and support compliance with DoD STIG and RMF requirements., Tenable Security Center / ACAS

 * Administer and optimize Tenable.sc and Nessus, including scan policies, scan zones, repositories, credentials, and audit files.
 * Perform credentialed vulnerability scans, STIG compliance scans, discovery scans, and port scans.
 * Analyze and interpret STIGs, CKLs, ACAS/Tenable findings, and vulnerability results to support compliance and risk reduction.
 * Leverage Windows and Linux administration skills to support and troubleshoot authenticated vulnerability scanning.
 * Conduct false-positive analysis and validation to ensure accurate vulnerability reporting.
 * Collaborate with Cloud, Network, Platform, Security, and Engineering teams to drive vulnerability remediation and system hardening.

Vulnerability Coverage & Asset Discovery

 * Identify and close gaps in vulnerability scan coverage to ensure comprehensive visibility across the environment.
 * Perform asset discovery and maintain accurate inventories to ensure all in-scope systems are included in scanning cycles.
 * Analyze scan results to identify coverage gaps, unscanned assets, and compliance blind spots.
 * Recommend corrective actions to improve vulnerability visibility, scanning effectiveness, and overall security posture, Description The Defense Sector at Leidos is seeking an experienced Senior Systems Engineer to support an exciting Air Force Life Cycle Management Center program. This role involv…
 + Just now, Description The Defense Sector at Leidos is seeking an experienced Senior Systems Engineer to support an exciting Air Force Life Cycle Management Center program. This role involv…
 + Just now
+


## Related Videos

- [Green Cloud Computing](https://www.wearedevelopers.com/videos/592-green-cloud-computing)
- [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers)
- [WebAssembly: The Next Frontier of Cloud Computing](https://www.wearedevelopers.com/videos/972-webassembly-the-next-frontier-of-cloud-computing)
- [Hacking MSSQL on Cloud. All of them. How I became sysadmin on Azure, AWS, GCP and Alibaba.](https://www.wearedevelopers.com/videos/100339-hacking-mssql-on-cloud-all-of-them-how-i-became-sysadmin-on-azure-aws-gcp-and-alibaba)
- [You can’t hack what you can’t see](https://www.wearedevelopers.com/videos/41-you-can-t-hack-what-you-can-t-see)
- [Leverage Cloud Computing Benefits with Serverless Multi-Cloud ML ](https://www.wearedevelopers.com/videos/78-leverage-cloud-computing-benefits-with-serverless-multi-cloud-ml)

## Related Articles

- [9 Ways to Make Money Hacking](https://www.wearedevelopers.com/magazine/333-9-ways-to-make-money-hacking)
- [Understanding and Mitigating Common Web Vulnerabilities](https://www.wearedevelopers.com/magazine/565-understanding-and-mitigating-common-web-vulnerabilities)
- [Events like RSAC Get You CISOs. Developers Decide What Actually Gets Deployed.](https://www.wearedevelopers.com/magazine/693-events-like-rsac-get-you-cisos-developers-decide-what-actually-gets-deployed)
- [Walking Into The Era of Supply Chain Risks](https://www.wearedevelopers.com/magazine/106-walking-into-the-era-of-supply-chain-risks)
- [Dev Digest 134 - Where pixels sing?](https://www.wearedevelopers.com/magazine/477-dev-digest-134-where-pixels-sing)
- [The Overflow: Security and Privacy](https://www.wearedevelopers.com/magazine/715-the-overflow-security-and-privacy)