Senior Cybersecurity Engineer – Information System Security Engineer

Seneca Holdings

. Implement and maintain technical security controls under the NIST Risk Management Framework and NIST SP 800-53 .

Posted 10/26/2026full-timeRemote • Missouri • United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in implementing and maintaining technical security controls under the NIST Risk Management Framework, including vulnerability management and compliance assessments for both on-premises and cloud environments. Proficient in administering enterprise systems, conducting vulnerability assessments, and ensuring adherence to security standards and best practices.

Highest-signal resume keywords

NIST Risk Management Framework (RMF)Vulnerability ManagementAWS Security ComplianceCompTIA Security+ CertificationTop Secret (TS) Security Clearance

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Vulnerability AssessmentsSecurity Control ImplementationConfiguration ManagementTechnical Security DocumentationEndpoint ProtectionLinux System AdministrationWindows Server AdministrationAutomated Compliance AssessmentsSecurity Configuration BaselinesTechnical Remediation

Tools & Technologies

Tenable NessusTenable Security CenterHBSSTrellix/McAfee ePOAnsiblePowerShellBashDISA STIGsSCAPAWS Security Services

Certifications & Qualifications

CompTIA Security+AWS Certified Solutions ArchitectAWS Certified SysOps AdministratorAWS Certified Security – SpecialtyCISSPCompTIA SecurityXCySA+RHCSA

Industry Keywords

Information AssuranceCybersecurity EngineeringFederal ComplianceDoD RegulationsContinuous Monitoring

Tech Stack

Tools & technologies

AnsibleAWSCloudCyber SecurityLinuxTypeScript

About the role

Key responsibilities & impact

Implement and maintain technical security controls under the NIST Risk Management Framework and NIST SP 800-53
Support Information Security Continuous Monitoring activities under NIST SP 800-137
Provide engineering support throughout the RMF authorization lifecycle and assess security control effectiveness
Develop corrective actions for security control weaknesses
Maintain System Security Plans, control implementation statements, assessment evidence, and POA&Ms
Evaluate system changes for cybersecurity impacts and maintain approved security configuration baselines
Provide technical evidence and remediation support for ATO activities
Administer Tenable Nessus and Tenable Security Center, including scanners, repositories, policies, credentials, and reporting
Conduct authenticated and unauthenticated vulnerability assessments and prioritize remediation
Coordinate vulnerability remediation and validate effectiveness through follow-up scans
Implement DISA STIGs and SRGs and conduct automated and manual compliance assessments
Develop and maintain secure configuration baselines and investigate configuration deviations
Administer and troubleshoot HBSS and successor endpoint security technologies, including Trellix/McAfee ePO
Manage endpoint security policies, agent deployments, updates, health monitoring, and alerts
Administer, secure, patch, harden, and troubleshoot RHEL and Microsoft Windows Server systems
Support configuration management, change control, technical documentation, and secure enterprise operations
Support AWS security compliance, vulnerability management, identity and access management, monitoring, and configuration assessments
Identify and remediate cloud security misconfigurations and support on-premises/cloud security integration
Collaborate with ISSMs, ISSOs, system administrators, network engineers, infrastructure teams, and system owners

Requirements

What you’ll need

Minimum of 10 years of relevant professional experience in cybersecurity engineering, information assurance, vulnerability management, or enterprise security operations
Experience supporting DoD, federal government, or similarly regulated enterprise environments
Hands-on experience conducting vulnerability assessments, implementing security controls, and remediating technical security findings
Experience administering, configuring, and securing enterprise Windows and Linux systems
Experience supporting RMF compliance, continuous monitoring, and security authorization activities
Strong understanding of enterprise infrastructure, operating system security, endpoint protection, and vulnerability management principles
Current CompTIA Security+ certification required
Current AWS certification required, such as AWS Certified Solutions Architect, AWS Certified SysOps Administrator, AWS Certified Security – Specialty, or another relevant AWS certification
Must meet applicable DoD 8140 qualification requirements for the designated cybersecurity work role and proficiency level
Top Secret (TS) security clearance required for full performance; candidates with an active Secret clearance may be considered if eligible and willing to undergo the TS process
Demonstrated experience with NIST RMF, NIST SP 800-53, NIST SP 800-137, DISA STIG/SRG, eSTIG, SCAP, Tenable.sc, Tenable Nessus, HBSS, RHEL, Windows Server, AWS security, and technical compliance documentation
Experience with Trellix/McAfee ePO and enterprise endpoint security management
Experience automating configuration, compliance assessments, and remediation using Ansible, PowerShell, Bash, or similar technologies
Experience with AWS security services and federal cloud compliance requirements
Experience developing vulnerability metrics, compliance dashboards, and technical security reports
Familiarity with enterprise networking, firewall configurations, and network security principles
Additional certifications such as CISSP, CompTIA SecurityX, CySA+, RHCSA, or AWS Certified Security – Specialty are desired

Benefits

Comp & perks

Competitive pay
Medical, dental, and vision insurance
Life and disability insurance
Voluntary critical illness, hospital, and accident benefits
Health savings accounts (HSAs)
Flexible spending accounts (FSAs)
Retirement 401(k) plan
Paid leave programs
Flexible work-life balance
Professional development opportunities
Performance and recognition programs
Collaborative work environment
Hiring preference for Seneca or Native individuals