Senior Cyber Security Engineer

Senior Cyber Security Engineer

Vienna, VA

Senior Cyber Security Engineer supports critical DoD and Intel missions and programs. The role focuses on cybersecurity engineering, risk management, and compliance across the cloud and on‑prem systems, supporting system authorization, vulnerability management, and secure operations in classified environments.

• Applying RMF processes to support system Assessment & Authorization (A&A), including control selection, implementation, assessment, and continuous monitoring
• Developing, reviewing, and maintaining security documentation such as SSPs, POA&Ms, SARs, and ATO artifacts in tools such as XACTA or eMASS
• Conducting vulnerability assessments and compliance scans (e.g., ACAS) and tracking remediation of findings and IAVM requirements
• Implementing and validating security controls aligned with NIST 800‑53, CNSSI 1253, and related DoD guidance
• Supporting system hardening, patching, and configuration management in compliance with STIGs for Linux, Windows, and network devices
• Monitoring systems for security events and supporting incident response and risk mitigation activities
• Assessing security impacts of system changes and supporting configuration control boards (CCBs)
• Collaborating with system engineers, administrators, and Dev Sec Ops  teams to integrate security throughout the system lifecycle
• Providing cybersecurity risk input to program leadership, Authorizing Officials (AOs), and stakeholders
• Other duties as assigned

• Bachelor’s degree with 5+ years of experience (or equivalent experience)
  • Experience with RMF, A&A, POA&M, and ATO documentation (XACTA/eMASS)
  • Experience securing Linux and Windows systems, STIGs, patching, and system hardening
• DoD 8570 IAT Level II or higher certification (e.g., Security+, CySA+, CISSP)
• Active or Current (within two years of active) Top Secret Security Clearance with SCI eligibility

• Scripting or development experience (Python, Java, React)
• Dev Sec Ops  tools and pipeline experience
• Experience with Linux (Red Hat/CentOS), databases, web apps, or big data platforms
• Familiarity with Agile environments and tools (Jira, Confluence)
• Experience with NIST SP 800‑171 and System Security Engineering (SSE)

• Hands‑on vulnerability scanning and compliance tracking (ACAS, IAVM)
• Knowledge of NIST 800‑series publications and incident response processes
• Strong analytical, communication, and collaboration skills
• Ability to work independently and yet be effective within a team setting
• Must be capable of managing multiple efforts with time‑related constraints in a fast‑paced contracting environment
• Demonstrated ability to effectively communicate and collaborate with diverse internal and external stakeholder groups and individuals
• Friendly presence, helpful attitude, good interpersonal skills, and ability to work well with others.
• Excellent skills in Microsoft Word, Excel, and other Office applications
• Proficient with Microsoft Office Applications, and experience working in a home office setting, as well as the ability to train end users on frequently asked technical issues.
• Ability to provide technical assistance and support over the phone; good phone skills, professional demeanor, and previous customer service experience strongly desired.
• Good problem‑solving skills; ability to visualize a problem/situation and think abstractly to solve it

At Chenega MIOS, we know that great people make a great organization. We value our team members and offer them a broad range of benefits.