Mission-Critical ISSE: Secure System Design & RMF

Adaptic LLC; Annapolis (MD); On-site; USD 120,000 - 180,000; Full time

Job summary

Adaptic LLC seeks an Information Systems Security Engineer (ISSE) to design, engineer, and strengthen security for mission-critical DoD/IC systems. You’ll work across the system lifecycle—from design to sustainment—balancing security, performance, and mission needs.

You will apply RMF and risk frameworks, develop security documentation, and collaborate with engineers and program teams to implement secure solutions.

Qualifications

• All positions require an active TS/SCI with polygraph.
• Experience in information systems security engineering, cybersecurity, or related roles.
• Strong understanding of RMF and security frameworks (e.g., NIST 800-37, 800-53).
• Experience developing or supporting security documentation and authorization processes.
• Familiarity with system hardening, vulnerability management, and compliance tools.
• Ability to communicate security concepts clearly across technical and non-technical teams.
• A degree in Computer Science, Information Assurance, Cybersecurity, or a related field (or equivalent experience).

Responsibilities

• Performing and reviewing security assessments of complex systems and environments.
• Designing and integrating secure system, network, and enclave architectures.
• Applying RMF and other risk frameworks to support system authorization and compliance.
• Developing and maintaining security documentation (e.g., SSPs, RMF artifacts, ATO packages).
• Identifying vulnerabilities and recommending mitigation strategies.
• Supporting security planning, risk analysis, and system hardening efforts.
• Ensuring compliance with NIST, NSA, and DoD security policies and standards.
• Collaborating with system engineers, network engineers, and program teams to implement secure solutions.
• Supporting continuous monitoring and ongoing system security improvements.
• Advising stakeholders on security requirements, trade-offs, and best practices.

Skills

Active TS/SCI with polygraph

Information systems security

RMF knowledge

Security documentation

Vulnerability management

Clear communication

Education

Bachelor's in CS/Info Assurance/Cybersecurity

Tools

Nessus

Xacta

STIG Viewer

SCAP Compliance Checker

Job description

Adaptic LLC seeks an Information Systems Security Engineer (ISSE) to design, engineer, and strengthen security for mission-critical DoD/IC systems. You’ll work across the system lifecycle—from design to sustainment—balancing security, performance, and mission needs.

You will apply RMF and risk frameworks, develop security documentation, and collaborate with engineers and program teams to implement secure solutions.