Information System Security Engineer III at TRISTAR

Location: Bloomington, Indiana
Type: Full-time
Level: senior
Posted: Sep 4, 2026

Description

TRISTAR is seeking an Information System Security Engineer III to provide senior cybersecurity engineering and Information Assurance System Architecture and Engineering support for complex Department of War networks and information systems. The role integrates security requirements across the system lifecycle, develops secure architectures and solutions, leads RMF authorization and security assessments, supports incident response and forensics, advises Government stakeholders, and mentors junior engineers. It requires a relevant bachelor's or master's degree, CASP or CISSP, 10+ years of progressively responsible experience, DoD 8570/8140 IASAE Level III qualification, and U.S. citizenship.

Required Skills

Security architecture
Systems engineering
Zero Trust
RMF
Threat modeling
Vulnerability management
Identity management
Incident response
Security clearance

Additional Information

Minimum Education: Bachelor's or Master's degree in Computer Science, Cybersecurity, Information Security, Information Assurance, Systems Engineering, or a related technical field
Required Previous Experiences: 10+ years of progressively responsible experience in systems engineering, cybersecurity engineering, information assurance, security architecture, or a related technical discipline
Four years of directly relevant ISSE experience may be considered in lieu of the degree requirement
Experience designing, engineering, implementing, or assessing security architectures for complex information systems and networks
Extensive experience supporting the DoD Risk Management Framework and system authorization process
Experience developing, reviewing, and maintaining RMF security authorization documentation
Experience conducting threat modeling, security assessments, vulnerability assessments, risk assessments, and security architecture reviews
Experience designing and implementing security solutions for networks, applications, databases, cloud environments, and enterprise infrastructure
Experience analyzing security logs, identifying anomalous activity, and supporting cybersecurity incident response and mitigation
Experience applying DISA STIGs/SRGs and NIST security controls to complex enterprise environments
Experience implementing or assessing Zero Trust Architecture in DoD environments
Experience supporting systems with high mission impact or highly sensitive/classified information
Experience working directly with DoD, Intelligence Community, or other Federal Government customers
Experience leading cybersecurity architecture reviews, technical working groups, and engineering change processes
Experience mentoring and providing technical direction to junior and mid-level cybersecurity engineers
Translation Company Name: Tristar Inc