TensableSE (ACAS) Engineer

Apex Systems; Texas; On-site; USD 83,000 - 131,000; Full time

Job summary

Everforth Apex Systems is seeking a Tenable Security Engineer to support DISA environments with expert administration of Tenable.sc and Nessus. You will run credentialed scans, interpret STIG findings, and drive remediation with security and engineering teams.

The role requires DoD Secret access, strong Windows/Linux admin skills, and collaboration across multiple IT domains on long-term contracts.

Qualifications

• Experience administering Tenable.sc/Nessus and credentialed scans.
• Strong knowledge of STIGs, CKLs, and ACAS findings.
• Proficiency in Windows and Linux administration for authenticated scans.

Responsibilities

• Manage and tune vulnerability scanning across DISA locations.
• Collaborate with Cloud, Network, Platform, Security, and Engineering teams to remediate findings.
• Perform validation, false positive analysis, and coverage assessments.

Skills

Tenable.sc

Nessus

Vulnerability scanning

STIGs/CKLs/ACAS

Windows Admin

Linux Admin

Cross-functional collab

Tools

ACAS

Nessus

Tenable.sc

Job description

## Job Description# TensableSE (ACAS) EngineerApply**Job#: 3057214****Job Description:****Tenable Security Engineer****Duration:** Long-term contract**Locations:** All DISA locations are acceptable as long as the candidate has access to SIPR:* Mechanicsburg, PA* Ogden, UT* Nebraska, Offutt Air Force Base* Peterson Space Force Base* Schriever Space Force Base* Cheyenne Mountain Complex* U.S. Air Force Academy* Montgomery, AL* Oklahoma City, OK* San Antonio, TX**Preferred Locations:** Oklahoma City, OK; Ogden, UT; Mechanicsburg, PA; Montgomery, AL**Percentage Travel:** 25%**Certification Requirement:** IAT Level I***Candidates must be able to obtain and/or maintain a Department of Defense Secret clearance as a condition and continuation of employment.*****Tenable Security Center:**• Expert administration of Tenable.sc and Nessus, including scan policies, scan zones, repositories, credentials, and audit files.• Hands-on experience performing credentialed vulnerability scans, STIG compliance scans, discovery scans, and port scans.• Strong understanding of STIGs, CKLs, ACAS/Tenable findings, and vulnerability remediation processes.• Strong Windows and Linux administration skills supporting authenticated vulnerability scanning.• Strong collaboration skills for working with Cloud, Network, Platform, Security, and Engineering teams to drive remediation and system hardening.• False Positive Analysis & Validation• Scan Coverage, Asset Discovery, and Gap Analysis *Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico.**Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy**Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.**Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.**If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [e-mail] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.**UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.***Employee Type:** Contract**Location:** Montgomery, TX, US**Job Type:****Date Posted:** October 27, 2026**Pay Range:** $60 - $95 per hour