Cybersecurity Engineer III with Security Clearance

Cybersecurity Engineer III
Key Personnel | Req  
Charleston, South Carolina | Department of Defense C4I Program
Clearance: TS/SCI eligible About Nationwide IT Services
Nationwide IT Services (NIS) is a mission-driven IT and management consulting company serving government customers. Founded in 2006, NIS delivers cybersecurity, enterprise IT, cloud, digital services, Dev Sec Ops , AI, data analytics, and mission support solutions. NIS is a Service-Disabled Veteran-Owned Small Business committed to innovative, value-added solutions delivered with integrity and a people-first culture that invests in professional growth and service.

Position Summary
NIS is seeking an experienced Cybersecurity Engineer III to serve as Key Personnel supporting a Department of Defense Command, Control, Communications, Computers, and Intelligence (C4I) program. This senior-level engineer will provide cybersecurity engineering across the system lifecycle, translating mission and security requirements into secure architecture, RMF evidence, hardening decisions, remediation plans, and authorization-ready artifacts. Success requires strong technical judgment, disciplined documentation, and effective collaboration with government and contractor teams.

Key Responsibilities

• Design, implement, and maintain secure system architectures for mission-critical C4I environments.

• Perform cybersecurity engineering across planning, design, development, integration, testing, deployment, operations, and sustainment activities.

• Support Risk Management Framework (RMF) activities, including control implementation, assessment support, authorization evidence, and continuous monitoring.

• Analyze security requirements, system interfaces, data flows, and proposed changes to identify risk and recommend practical mitigations.

• Conduct or support security assessments, review vulnerability findings, prioritize remediation, and verify corrective actions.

• Apply and validate secure configuration guidance, including applicable DISA Security Technical Implementation Guides (STIGs).

• Develop and maintain cybersecurity artifacts, including security plans, control narratives, risk assessments, diagrams, test evidence, and Plans of Action and Milestones (POA&Ms).

• Support technical reviews, configuration and change control, security testing, authorization milestones, and clear communication of risks and recommended actions.

Minimum Qualifications

Education:

Bachelor's degree in Cybersecurity, Computer Engineering, Electrical Engineering, Electronics Engineering, Mathematics with a concentration in Computer Science, or equivalent.
Certification:
Current DoD 8570/8140-compliant certification meeting IAM Level II, IAT Level II, or IASAE Level II requirements.

Experience:

Minimum of 10 years of professional cybersecurity engineering experience.
DoD C4I

Experience:

At least 4 years supporting DoD C4I systems.

Preferred Qualifications

• Hands-on RMF experience.

• Experience implementing and validating DISA STIGs.

• Experience with ACAS, SCAP, eMASS, or HBSS.

• Experience supporting NAVWAR or other Navy programs. Why Join NIS?
Join a trusted government contractor supporting high-impact defense missions alongside experienced professionals in a collaborative, growth-focused environment. NIS invests in professional development, recognition, and opportunities to contribute to work that matters. Benefits
For eligible employees, NIS offers medical, dental, and vision insurance; life and disability insurance; a 401(k) plan with employer match; paid holidays; paid time off; commuter benefits; an employee assistance program; educational reimbursement; and pet insurance. Eligibility and offerings may vary based on employment classification and plan terms. Salary range $100,000 to $175,000 annually The salary range is a general guideline.

We consider several factors when determining base salary offers, including the position's scope and responsibilities, the candidate's experience, education, and skills, and current market conditions.