Cybersecurity Engineer

GDIT is your place. You make it your own by embracing autonomy, seizing opportunity, and being trusted to deliver your best every day. We think. We act. We deliver. There is no challenge we can’t turn into opportunity. Our work depends on TS/SCI level cleared Cybersecurity Engineer joining our team to support our Intelligence customer in Springfield, VA or St. Louis, MO.

This position supports the Geospatial Services & Solutions business area to provide high-quality, cost-effective solutions to the customer. As part of the GSS Team the cybersecurity engineer’s expertise is needed to support a sophisticated enterprise environment.

• Act as the representative of the Information System Security Manager (ISSM), ensuring compliance with DoD and Intelligence Community (IC) information security policies, procedures, and directives.
• Support efforts to operate, maintain, and dispose of information system materials in accordance with RMF, NIST, ICD 503, and applicable security directives, policies, and System Security Plans (SSPs).
• Implement and maintain Security Technical Implementation Guides (STIGs) across Windows, Linux (RHEL), network, virtualization, and cloud environments to ensure compliance with DoD security requirements.
• Execute technical remediation activities to address security findings identified through ACAS, STIG reviews, vulnerability scans, and security assessments.
• Manage assigned Plan of Action and Milestones (POA&Ms) by implementing technical solutions, validating remediation efforts, documenting completion evidence, and supporting POA&M closure.
• Support RMF continuous monitoring activities by implementing required security controls, maintaining A&A documentation, and ensuring compliance with NIST SP 800-53 and ICD 503 requirements.
• Generate and implement required cybersecurity awareness training, ensuring users understand their security responsibilities prior to system access.
• Initiate protective and corrective measures when security incidents, vulnerabilities, or compliance issues are identified.
• Ensure IA hardware, software, and operating systems comply with approved security configuration guides and organizational security baselines.
• Implement and enforce IA policies and procedures as defined by RMF authorization packages and A&A documentation.
• Ability to work on multiple projects simultaneously in a dynamic, fast-paced, team-oriented environment.
• Perform Operations & Sustainment (O&S) functions for enterprise network security infrastructure, including firewalls, web gateways, mail gateways, IDS/IPS, load balancers, performance monitoring tools, and management systems.
• Perform maintenance, hardening, patching, and advanced configuration of security infrastructure to protect enterprise networks from emerging cyber threats.
• Support and secure Cloud Infrastructure, including AWS-based technologies.
• Utilize enterprise security tools such as ACAS, HBSS, Carbon Black, Tanium, Red Seal, and related cybersecurity platforms.
• Conduct forensic network traffic and log analysis to investigate incidents, isolate issues, and respond to analyst alerts.
• Respond to escalated cybersecurity and infrastructure troubleshooting requests.
• Maintain and administer network infrastructure standards, documentation, and fault-tolerant configurations.
• Present monitoring, testing, compliance, and remediation results and reports as required.
• Perform and support integration testing, security validation, and operational readiness activities.
• Develop automation and scripting solutions using Power Shell, Bash, Python, or similar languages to improve security operations and compliance.
• Collaborate with systems, network, and cloud engineering teams to implement secure architectures and operational best practices.
• Participate in special projects as required.

• Experience implementing and supporting the Risk Management Framework (RMF) throughout the system lifecycle.
• Strong knowledge of NIST SP 800-53, ICD 503, and DoD cybersecurity policies.
• Hands‑on experience implementing, maintaining, and remediating Security Technical Implementation Guides (STIGs) across Windows, Linux (RHEL), network, virtualization.
• Experience executing technical remediation activities for vulnerabilities identified through ACAS, STIG compliance reviews, and other vulnerability management tools.
• Experience writing, maintaining, and closing Plan of Action and Milestones (POA&Ms), including documenting remediation evidence and validating corrective actions.
• Experience implementing and maintaining Assessment & Authorization (A&A) documentation and supporting RMF continuous monitoring activities.
• Experience with security tools such as ACAS, HBSS, Carbon Black, Tanium, Red Seal, or equivalent.
• Experience installing, hardening, deploying, documenting, and troubleshooting network perimeter security technologies.
• Experience scripting with Unix/Linux (RHEL), Bash, Python, and Power Shell.
• Strong analytical, troubleshooting, documentation, and…