Senior Cybersecurity Engineer / Information System Security Engineer (ISSE) (DoD Cybersecurity)

Location: Remote - Missouri; support for DoD information systems.

Company

hirify.global' federal government contracting business supports mission-critical needs of federal civilian, defense, and intelligence community customers through the Seneca Nation Group portfolio.

What you will do

• Implement and maintain NIST RMF security controls, support continuous monitoring, and provide technical support throughout the authorization lifecycle.
• Maintain System Security Plans, control implementation statements, assessment evidence, POA&Ms, ATO evidence, and technical compliance documentation.
• Administer Tenable Nessus and Tenable Security Center, conduct vulnerability assessments, prioritize findings, coordinate remediation, and validate results.
• Implement DISA STIGs and SRGs, perform SCAP and eSTIG assessments, maintain secure configuration baselines, and support inspections and audits.
• Administer HBSS and endpoint security platforms, including Trellix/McAfee ePO, while investigating alerts and resolving policy, agent, and compliance issues.
• Secure and administer RHEL, Microsoft Windows Server, and AWS environments, including patching, hardening, configuration management, cloud security, and system integration.

Requirements

• At least 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, including vulnerability assessments, security controls, and technical remediation.
• Experience administering, configuring, and securing enterprise Windows and Linux systems, with strong knowledge of infrastructure security, endpoint protection, and vulnerability management.
• Experience supporting RMF compliance, continuous monitoring, and security authorization activities.
• 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 security clearance required for full performance. Candidates with an active Secret clearance may be considered if eligible and willing to complete the Top Secret investigation and adjudication process.

Nice to have

• Practical experience with NIST RMF, NIST SP 800-53, NIST SP 800-137, configuration management, DISA STIGs and SRGs, eSTIG, SCAP, Tenable, HBSS, RHEL, Windows Server, endpoint security, AWS security, and technical compliance documentation.
• Previous ISSE experience in a DoD environment and experience with RMF authorization packages and ATO activities.
• Familiarity with DoD cybersecurity policies, control assessment procedures, and continuous monitoring requirements.
• Experience with Trellix/McAfee ePO, Ansible, PowerShell, Bash, AWS security services, federal cloud compliance, vulnerability metrics, compliance dashboards, and technical security reports.
• Experience supporting complex mission-critical enterprise information systems and familiarity with enterprise networking, firewalls, and network security.
• Additional certifications such as CISSP, CompTIA SecurityX, CySA+, RHCSA, or AWS Certified Security – Specialty.

Culture & Benefits

• Remote full-time employment with a collaborative work environment and flexible work-life balance.
• Medical, dental, vision, life, and disability benefits.
• Health savings and flexible spending accounts, voluntary benefit programs, and a retirement 401(k) plan.
• Paid leave and benefits eligibility for full-time employees working at least 30 hours per week on a regular basis.
• Professional development, performance recognition, and benefits supporting Seneca Nation members.

Hiring process

• Secret-cleared candidates may undergo a Top Secret clearance upgrade investigation and adjudication, subject to government and contractual approval.