Cyber Security Engineer – III DoS CSS

OneZero Solutions; Washington (District of Columbia); Remote; USD 120,000 - 150,000; Full time

Benefits offered by this job

Health, dental, vision, and life

401(k) with company matching

Paid time off and holidays

Employee referral program

Educational assistance

Job summary

OneZero Solutions LLC seeks a Cyber Security Engineer III to own Tenable vulnerability platform operations for DoD-related systems. The role focuses on engineering, scheduling scans, dashboards, and ensuring 24x7 availability, with on-call duties and RMF alignment.

Deep Tenable expertise and a SECRET clearance are required. Remote within the National Capital Region; OpenNet, PIV badge, and DoS handling rules apply.

Qualifications

• Seven or more years in cybersecurity or systems engineering with enterprise Tenable administration.
• Strong Linux and Windows admin skills and scripting for automation.
• Active SECRET clearance; U.S. citizenship.

Responsibilities

• Own engineering, operations, and maintenance of the Tenable vulnerability platform.
• Design scan templates, policies, schedules, and perform ad-hoc scans.
• Develop dashboards and reports for stakeholders; lead 24x7x365 availability.
• Mentor junior engineers and support RMF/DIACAP workflows.

Skills

Cybersecurity expertise

Scripting (Python/PowerShell/Bash)

On-call support

Linux administration

Windows administration

REST APIs

Education

Bachelor's degree in CS/IT/Cybersecurity

Tools

Tenable Security Center

Nessus

Nessus Agents

ServiceNow

Splunk

Job description

We are an employee-centric company that truly values our team members and the contributions they make to our customers and the missions they support. We pride ourselves on being forward-leaning thinkers and on building teams that are, and continue to be, technically proficient across a broad range of cyber mission areas. OneZero full-time employees receive a highly competitive benefits package, including health, dental, vision, and life insurance, a 401(k) with company matching, paid time off and holidays, an employee referral program, and educational assistance. Additional details are available on our website: https://www.onezerollc.com/careers/

Position Title

Cyber Security Engineer

Location

Remote; must reside within the National Capital Region (NCR).

Work Schedule

Full-time, 40 hours per week. Must be available during Department core hours of 9:00 a.m. – 3:00 p.m. ET, Monday – Friday, and flex working hours as needed to meet CST day-to-day and emergent requirements. No work is performed on Federal holidays or during Government closures. Participates in a rotating on-call schedule supporting 24x7x365 availability of the vulnerability and compliance scanning platforms.

Employment Type

Full-Time, Exempt (W-2), contingent upon Call Order award

Clearance

Secret

Position Summary

The Cyber Security Engineer III is the dedicated, full-time Tenable platform lead. The engineer owns engineering, operations, and maintenance of the CA Tenable vulnerability and compliance scanning platform used to assess on-premises consular systems (platform integrations, troubleshooting, backups, patching, user access, dashboard development, plugin updates, scan template design, and scan scheduling) and sustains 24x7x365 platform availability. The engineer also leads ad-hoc and BOD-driven scanning and agent deployment and integration efforts.

Key Responsibilities

• Serve as the dedicated, full-time Tenable subject matter expert; maintain 24x7x365 platform availability and lead the on-call rotation.
• Administer the Tenable platform end to end: integrations, troubleshooting, backups, patching and version upgrades, user access and role management, plugin and feed updates.
• Design and maintain scan templates, policies, and schedules to ensure required coverage: weekly servers, monthly workstations, and any additional cadence required by Binding Operational Directives (RMF Step 6).
• Perform ad-hoc and BOD-specific scans on request to confirm hardened server builds for developers, production applications, and appliances.
• Ensure all in-scope assets are onboarded, grouped, and tagged in Tenable in accordance with CA configuration standards; support CA iPost application groupings and asset inventory accuracy.
• Develop dashboards, reports, and metrics for the ISSM, AO, ISSOs, and other stakeholders, including KEV, CVE, and STIG compliance reporting.
• Lead Nessus Agent deployment, data ingest and sharing, pipeline, and other integration efforts.
• Deliver vulnerability and compliance scan results to ISSOs within timelines and to the assessment team during RMF Step 4.
• Coordinate logistics for Red Cell penetration testing and Blue Team cyber hygiene scans; support hardened-build verification.
• Document platform architecture, SOPs, and configuration baselines; provide Tenable evidence for the Evidence Index and SSPs.
• Mentor the Cyber Security Engineer on platform operations and serve as escalation point for scanning issues.

Required Qualifications

• Seven (7)+ years of cybersecurity or systems engineering experience, including four (4)+ years administering Tenable (Tenable Security Center / tenable.sc, Nessus, Nessus Agents, Tenable One / Vulnerability Management) at enterprise scale.
• Strong Linux and Windows administration skills and scripting proficiency (Python, PowerShell, or Bash) including use of REST APIs for automation and reporting.
• Experience with STIG/SCAP compliance scanning and audit files.
• Active, final SECRET security clearance; U.S. citizenship.
• DoD 8140/8570 IAT Level III baseline certification (e.g., CISSP, CASP+, GCIH, GCED) or IAT Level II with ability to obtain Level III within 6 months.
• Experience supporting a 24x7 on-call rotation for a production security platform.

Preferred Qualifications

• Tenable certifications (Tenable Security Center Specialist, Nessus Specialist, Tenable One).
• Department of State experience, including iPost integration; DoD ACAS experience.
• Experience with Wiz or another CNAPP for cloud scanning; SIEM (Splunk) integration.
• Experience with CISA BOD 22-01 (KEV) and BOD 23-01 asset visibility reporting.

Technical Skills

• Tenable Security Center / tenable.sc, Nessus Manager and Scanners, Nessus Agents, Tenable One; plugin/feed management; scan policy and credentialed-scan design.
• SCAP/STIG benchmarks, DISA STIG Viewer, CIS benchmarks.
• Linux (RHEL) and Windows Server administration; Python/PowerShell/Bash; Tenable REST API.
• Dashboards and reporting; ticketing (ServiceNow or equivalent); SIEM integration.

Education

Bachelor's degree in Computer Science, Information Technology, Cybersecurity, or a related field, or an additional four (4) years of directly relevant experience in lieu of degree.

Remote/Hybrid/On-site and any other relevant work-environment requirement

Remote. Duties are performed remotely; the selected candidate must reside within the National Capital Region (NCR). The Government does not furnish equipment; OneZero provides the laptop and collaboration tools. Position requires an OpenNet account, DoS PIV badge, multifactor authentication, and adherence to DoS SBU/CUI handling requirements. Local travel within the National Capital Region; minimal other travel.

Position Status

New Position, contingent upon Call Order award

OneZero Solutions LLC is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status.