Sr. Systems Security Engineer

Position Overview

Argo Cyber Systems is seeking a Senior Cybersecurity Engineer with specialized experience supporting U.S. Department of Defense (DoD) and U.S. Navy cybersecurity programs. The ideal candidate will possess hands-on expertise in vulnerability analysis, STIG implementation, risk assessments, and system accreditation , as well as the ability to conduct and lead TEMPEST testing in accordance with national standards. This position plays a critical role in ensuring mission assurance, data protection, and compliance across classified and unclassified information systems.

This position contingent on contract award.

Key Responsibilities

• Perform comprehensive vulnerability and risk analyses for DoD / Navy information systems, identifying exploitable weaknesses and developing mitigation plans.
• Execute SCAP scans , interpret results, and implement remediation actions in line with DISA STIG requirements.
• Develop and apply system hardening baselines for operating systems, network devices, and applications.
• Conduct virus, malware, and malicious code scanning , ensuring system and network hygiene.
• Lead or support system accreditations, ATO / ATC processes, and cybersecurity audits in accordance with DoD RMF guidance (NIST SP 800-53 / 800-37).
• Conduct and lead TEMPEST testing using approved test plans, production test procedures, and the current National TEMPEST Standard , documenting findings and recommendations.
• Prepare detailed reports, risk assessments, and compliance documentation for government review.
• Collaborate with system owners, ISSMs, and network engineers to ensure secure design, configuration, and operation of all systems.
• Maintain situational awareness of evolving DoD / Navy cybersecurity directives, policies, and tools.

Required Qualifications

DISA STIGs, SCAP Compliance Checker (SCC), and ACAS / Nessus vulnerability scanners

Preferred Qualifications

About Argo Cyber Systems

Argo Cyber Systems, LLC is a Service-Disabled Veteran-Owned Small Business (SDVOSB) delivering mission-critical cybersecurity, compliance, and systems engineering support to the U.S. Government. Our team supports complex cyber operations across DHS, DoD, and Intelligence Community customers-helping secure national defense infrastructure and advance Zero Trust modernization.

Argo Cyber Systems, LLC is an equal opportunity employer!

Background & Drug Screening Disclaimer

© Argo Cyber Systems, LLC - All Rights Reserved

Argo Cyber Systems, LLC is committed to maintaining a safe, secure, and trusted workplace for all employees and our federal clients. Employment with Argo Cyber Systems is contingent upon successful completion of all required background investigations and pre-employment screenings , which may include, but are not limited to :

Criminal background checks (federal, state, and local)

Employment and education verification

Reference checks

Drug screening (in compliance with federal and state law)

Security clearance verification (as applicable for classified positions)

Candidates selected for employment in positions requiring access to sensitive or classified information may also be subject to additional U.S. Government background investigations and security adjudication processes , including DHS Entry on Duty (EOD) suitability or equivalent federal clearance requirements.

Argo Cyber Systems reserves the right to disqualify or rescind an offer of employment based on the results of any background or screening process that, in the company's judgment, may impact an individual's ability to perform essential job functions or meet contractual obligations.

All background investigations and screenings are conducted in accordance with applicable federal, state, and local laws, including the Fair Credit Reporting Act (FCRA) . Candidates will be notified of their rights and provided an opportunity to review and dispute any adverse findings before final employment determinations are made.

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