Information Systems Security Engineer, TS//SCI with

About The Role

Location:
Alexandria, VA
Accrete is an agentic managed services company: an AI workforce that does high-stakes, judgement-heavy work for government and enterprise clients — at the economics of software, not labor.
At the core is Accrete’s Knowledge Engine, a dynamic context graph that captures an organization’s tacit knowledge, resolves data across silos, and builds a living, auditable ground truth. Expert agents reason against that ground truth to act on complex, high-stakes decisions — not just answer questions about them.
From national security to commercial operations, Accrete delivers the work on one platform, with unlimited expert agents and expert judgement.
The Role
As an Information Systems Security Engineer (ISSE) Mid, you will work at the intersection of
software engineering, cybersecurity, systems architecture, and government security requirements
. You will help ensure that Accrete's AI and data systems are designed, deployed, and operated securely in mission-critical environments.
You will work closely with software engineers, DevOps, security teams, data scientists, product teams, and government stakeholders to identify security requirements, assess technical risks, implement security controls, and support authorization and accreditation activities.
The ideal candidate is technically hands-on, understands modern software and cloud environments, and can translate security requirements into practical engineering solutions.

What You'll Do

Security Engineering
Apply security engineering principles throughout the system development lifecycle
Define and document system security requirements and technical security controls
Analyze system architectures and identify security risks, vulnerabilities, and potential attack vectors
Develop Authority to Operate (ATO)-ready security architectures for AI, data, cloud, and enterprise systems
Work with engineering teams to incorporate security controls into system designs and implementations
Support security assessments, risk assessments, vulnerability remediation, and continuous monitoring
Develop and maintain system security documentation, diagrams, control implementations, and technical artifacts
Evaluate proposed system changes for security impact
Support security reviews of new technologies, integrations, APIs, infrastructure, and software components
Ensure systems are designed according to applicable government security requirements and best practices
RMF & Authorization
Support Risk Management Framework (RMF) activities throughout the system lifecycle
Assist with the end-to-end ATO preparation, vulnerability remediation, approval processes, and maintenance
Develop and regularly update documentation supporting security authorization packages
Support implementation and assessment of NIST 800-53 security controls
Work with ISSOs, ISSMs, system owners, security teams, and government Authorizing Officials
Track security findings and coordinate remediation with engineering teams
Support Plan of Action and Milestones (POA&M) development and remediation
Maintain evidence demonstrating security control implementation
Support continuous monitoring and ongoing authorization activities
Technical Security
Assess application, infrastructure, network, cloud, and data security risks
Work with engineering teams to implement secure configuration and deployment practices
Support vulnerability management and remediation activities
Evaluate authentication, authorization, identity, access control, encryption, logging, and monitoring mechanisms
Review system and application configurations for security weaknesses
Support secure software development and DevSecOps practices
Help establish security requirements for APIs, integrations, data pipelines, and AI systems
Analyze security implications of new AI/ML technologies and architectures
Support security hardening of systems operating in classified or restricted environments
Engineering & Automation
Partner with software engineers, DevOps engineers, and platform teams to implement security solutions
Automate security checks, compliance validation, configuration management, and reporting where possible
Develop scripts and tooling to improve security operations and compliance workflows
Integrate security requirements into CI/CD pipelines and infrastructure-as-code processes
Help develop repeatable patterns for securely deploying Accrete capabilities across government security fabrics
Execute CVE scans, identify code fixes, configuration changes, and exception documentation needs to comply with a continuous ATO cycle
Troubleshoot complex technical and security issues across application and infrastructure layers
Mission & Customer Support
Work directly with government customers and technical stakeholders
Translate government security requirements into actionable engineering requirements
Support technical discussions, security reviews, demonstrations, and customer meetings
Communicate security risks and recommendations to both technical and non-technical stakeholders
Help customers understand the security architecture and controls supporting Accrete systems
Support deployment and accreditation of systems in customer-specific environments
What We're Looking For
Active TS//SCI clearance and Counterintelligence or Lifestyle Polygraph
3+ years of experience in information systems security engineering, cybersecurity, systems engineering, software engineering, or a related technical field
Bachelor's degree in Computer Science, Cybersecurity, Computer Engineering, Information Systems, or a related discipline
Strong understanding of system and application security principles
Experience with NIST security frameworks and NIST SP 800-53
Experience supporting RMF and/or ATO processes
Understanding of secure software development and DevSecOps practices
Experience evaluating technical architectures for security risks
Experience with identity and access management, authentication, authorization, encryption, logging, and monitoring
Strong technical documentation and communication skills
Ability to work directly with engineers and translate security requirements into technical solutions
Strong analytical and problem-solving skills
Ability to operate independently in a fast-moving environment

Preferred Qualifications

Experience supporting the Department of Defense, Intelligence Community, or other federal customers
Experience working in classified or air-gapped environments
Experience with
FedRAMP
or other federal cloud authorization frameworks
Experience with NIST SP 800-37, RMF, CNSSI, ICD, or DoD security requirements
Experience with AWS, Azure, Kubernetes, Docker, or cloud-native architectures
Experience with infrastructure-as-code such as Terraform
Experience with CI/CD and DevSecOps tooling
Experience with vulnerability scanning and security tools
Experience with Splunk, SIEM platforms, endpoint monitoring, or security logging
Experience with zero trust architectures and least-privilege access models
Experience securing AI/ML, LLM, data, or knowledge management systems
Experience with Python, Bash, PowerShell, or other scripting languages
Security certifications such as CISSP, Security+, or equivalent
Ability to obtain and maintain additional security clearance accesses to Special Access Programs (SAP) or Access Compensatory Control Measures (ACCM)
What Success Looks Like
Success in this role means
Accrete systems can be deployed and operated securely in demanding government environments without slowing down engineering velocity
.
You will serve as a bridge between security requirements and technical implementation, helping engineering teams understand what needs to be secured, why it matters, and how to implement the appropriate controls.
The strongest candidates will be technically credible with engineers, comfortable navigating federal security and authorization requirements, and able to identify practical solutions to complex security challenges.
Why Accrete Government
Work on advanced AI systems supporting U.S. government and national security missions
Solve challenging security and systems engineering problems
Work alongside experienced software engineers, AI researchers, DevOps engineers, and security professionals
Help deploy cutting-edge AI capabilities into secure and classified environments
Have direct exposure to government customers and mission requirements
Play a key role in building secure infrastructure for next-generation AI systems
Have significant ownership and direct mission impact
Salary: $
150k-$185k
The salary range provided reflects the estimated compensation for this role based on the expected qualifications and experience level. The final offer may vary depending on factors such as skills, experience, and alignment with role requirements.
Core Values & Expectations:
Impact
You take full ownership and accountability for your work, consistently seeing projects through from inception to completion with a strong bias for action. Proactively identifying challenges, you drive solutions rather than waiting for direction, and hold yourself and others to the highest standards for delivering results. With strategic thinking and a problem-solving mindset, you make informed decisions leveraging data and expertise, always looking for ways to improve processes, optimize workflows, and enhance outcomes beyond your immediate responsibilities.
Collaboration
You work seamlessly across teams, prioritizing shared goals and team success over individual credit. Engaged listening and open, candid communication are at the heart of your approach, ensuring alignment and synergy throughout the organization. You value diverse perspectives, seeking input from others to drive better results. By treating colleagues with respect and professionalism, you help build a culture of trust, supporting each other through challenges, celebrating successes, and constructively addressing conflicts to strengthen relationships and improve outcomes.
Passion for AI & Innovation
You are deeply excited about the transformative potential of AI and committed to contributing to a company shaping the future of work. With curiosity and a growth mindset, you continuously seek to learn, adapt, and stay at the forefront of new developments. Your enthusiasm for innovation drives you to explore new ideas, challenge the status quo, and find creative solutions that deliver meaningful impact. You approach your work with energy and a desire to advance both technology and the way we work.
Company Benefits
Competitive Salary:
Aligned with experience and market standards
Comprehensive Insurance:
Health, dental, and vision coverage for you and your family
401(k) Plan:
Build your financial future with our retirement savings plan
Growth & Development:
Access professional learning opportunities and career advancement support
Onsite Perks:
Enjoy catered lunches, snacks, and a fully stocked kitchen
Team Bonding:
Company-sponsored happy hours and social events to connect and unwind
Accrete is an equal opportunity/affirmative action employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.