Information Systems Security Engineer (ISSE)

Company: CACI
Location: Sterling
Posted on: April 1, 2026

Job Description:

Job Title: Information Systems Security Engineer (ISSE) Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US * * * The Opportunity: As an Information Systems Security Engineer (ISSE), you will perform advanced Information System Security Engineering support for various information systems throughout the system development lifecycle. Your responsibilities will include system hardening, preparing comprehensive assessment testing procedures, conducting system vulnerability scanning and mitigation, performing system maintenance and configuration, and ensuring thorough documentation. You will support the engineering team by providing direct input on the information system design to obtain and/or maintain a successful Authorization to Operate (ATO). You will perform in-depth analysis of various security hardening guides (DISA STIGs, CIS Benchmarks, vendor guides, SANS, etc.) to ensure security control coverage is addressed in the scanning methodology. Responsibilities: Assess and Mitigate Security Threats: Analyze and mitigate system security threats, risks, and vulnerabilities throughout the program life cycle. Contribute to security planning, assessment, risk analysis, risk management, certification, and awareness activities for system operations. Execute Assessment & Authorization (A&A): Perform the A&A process in accordance with government requirements (e.g., ICD-503). Maintain Accreditation Data: Ensure that accreditation data is maintained within customer databases (e.g., SNOW). Conduct Research: Research emerging technologies, vulnerability information, system hardening (e.g., STIGs), operating systems, application software, and security tools. System Configuration and Maintenance: Execute system configuration and maintenance in support of the Security Engineering discipline. Prepare Testing Documentation: Prepare comprehensive security assessment testing documentation to validate applied security controls in support of A&A testing. Provide Technical Guidance: Offer technical guidance focused on information security architecture. Generate Accreditation Artifacts: Create security accreditation artifacts, including Security Plans, Certification Test Plans, and Continuous Monitoring Plans. Track and Fulfill Liens: Track and fulfill liens associated with A&A activities as documented in the Plan of Actions and Milestones (POA&M). Perform Vulnerability Assessments: Conduct vulnerability assessments using standardized tools (Nessus, DISA STIGs) and perform configuration updates as required to comply with security requirements. Guide System Hardening: Provide guidance on the hardening of operating systems, COTS products, and Open-Source products to support compliance with security requirements. Engineering Services: Provide technical engineering services for the support of integrated security systems and solutions. Team Participation: Participate as a member of a security engineering team that designs, develops, implements, evaluates, and/or integrates security architectures, systems, or system components. Customer Interaction: Support and interact with customers in the enforcement of the design of security throughout the system life cycle. Apply IA Policies: Apply knowledge of IA policies and procedures disseminated by the customer’s organization. Qualifications: Required: Clearance: An active TS/SCI clearance with polygraph is required. Certification: Must have a current certification compliant with DoD 8570 IAM or IAT level 2. Education and Experience: Bachelor’s degree in Computer Science, Information Assurance, Information Security System Engineering, or equivalent and seven (7) years of directly related experience. Knowledge: Knowledge of DCID 6/3, ICD 503, CNSSI 1253, NIST SP 800-53, NIST SP 800-53A, NIST SP 800-37, and security controls assessment criteria/procedures. Experience: Implementing NIST 800-53 controls/ICD 503. Navigating projects through the RMF process to achieve IATT & ATO within the NRO environment. Participating in Assessment and Authorization (A&A) process. Preparing systems security documentation (e.g., security plans, risk assessment reports, Plan of Actions and Milestones (POA&Ms), etc.). Continuous Monitoring, mitigating scan findings, maintaining Ports, Protocols, and Services sheets (PPS). Vulnerability assessment scanning experience (Security Center/NESSUS). Working with engineers and system administrators to correct scan findings/system vulnerabilities. Creation/use of Security Center Dashboards and reports. Excellent communication and interpersonal skills. Efficient time management and workload management. Ability to support a flexible schedule and work in a dynamic, real-time environment with rapidly changing priorities. Desired: Proficient in Microsoft Application tools (i.e., Excel and PowerPoint). Experience with Sharepoint, Confluence, JIRA. Experience with developing test plans for information systems. Demonstrated system administration experience with Linux (Red Hat, CentOS) and/or Windows. Experience with DevOps. Familiarity with code quality and code analyzing security tools. Experience with Amazon Web Services (AWS): Should have current or ability to obtain an Amazon Cloud certification, such as AWS Certified Solutions Architect – Associate or AWS Certified Security Specialty. Audit log review: Ability to query and perform analysis in Splunk. Experience within the Intelligence Community. - What You Can Expect: A culture of integrity. At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation. An environment of trust. CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality. A focus on continuous growth. Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. The proposed salary range for this position is: $113,200 - $237,800 CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.

Keywords: CACI, Harrisonburg , Information Systems Security Engineer (ISSE), IT / Software / Systems , Sterling, Virginia