Sr. Systems Engineer - Herndon, VA - TS/CI with Poly

GDIT is seeking a highly experienced Senior Systems Engineer with a strong cybersecurity background to support, secure, and maintain classified systems. The position focuses on sustaining Cross-Domain Solutions (CDS) critical to secure information exchange across multiple classification levels. The ideal candidate will combine systems engineering expertise with cybersecurity best practices in classified environments to ensure system integrity, availability, and confidentiality.

• Lead cybersecurity engineering efforts to protect CDS and encrypted messaging/reporting platforms in a classified environment.
• Implement and maintain system security controls in accordance with IC and DoD cybersecurity policies.

• Support daily cybersecurity operations including system monitoring, incident response, vulnerability management, and remediation activities.
• Configure, maintain, and secure system components such as servers, databases, encryption devices, and secure communication channels.
• Ensure secure configuration, patch management, and hardening of operating systems (Linux/Windows) and application layers.
• Collaborate closely with cybersecurity teams, network engineers, ISSOs, and vendors to resolve security incidents and implement mitigation strategies.
• Support Authority to Operate (ATO) renewals, and assist with continuous monitoring requirements.
• Mentor and guide junior engineers on cybersecurity practices, secure system operation, and classified environment protocols.
• Participate in system integration, testing, and validation to ensure cybersecurity requirements are met.
• Support mission partners by providing cybersecurity expertise during operational and emergency situations.

Required Qualifications:

• Active TS/SCI with CI Poly

• Bachelor's degree in Cybersecurity, Systems Engineering, Computer Science, or related technical field (or equivalent experience).

• 8+ years of experience in systems engineering
• Demonstrated experience supporting or securing Cross-Domain Solutions (CDS)
• Deep understanding of classified network architectures, secure data flows, and encryption technologies.
• Strong proficiency with operating systems (Linux and Windows), system hardening, patch management, and security configuration.
• Proven skills in vulnerability assessment tools, intrusion detection/prevention systems, and incident response.
• Familiarity with IC cybersecurity policies and directives
• Excellent troubleshooting and problem-solving skills in complex, multi-domain environments.
• Strong communication skills with the ability to document technical findings clearly and coordinate with multidisciplinary teams.

Preferred Qualifications:

• Experience with system automation, scripting (Python, PowerShell, Bash), and cybersecurity tools.
• Familiarity with classified cloud environments (C2S, SC2S) and virtualization technologies.
• Prior experience working in a SCIF and adhering to IC physical and operational security controls.

GDIT IS YOUR PLACE:
• 401K with company match
• Comprehensive health and wellness packages
• Internal mobility team dedicated to helping you own your career
• Professional growth opportunities including paid education and certifications
• Cutting-edge technology you can learn from
• Rest and recharge with paid vacation and holidays.

Work Requirements