Information Systems Security Engineer

We are seeking an Information Systems Security Engineer (ISSE) to design, build, and integrate security into all information systems supporting the program, serving as the hands-on technical expert who translates Intelligence Community security requirements into engineered, implemented, and validated solutions. Spear AI is a growing defense contracting company dedicated to delivering cutting-edge solutions that support our nation's security. As we expand, we're building a culture where innovation meets mission-critical work. We operate with a flat organizational structure that empowers every team member to make an impact, collaborate directly with leadership, and contribute to projects that matter. Whether you're joining our Hardware, Software, or Services division, you'll work alongside talented professionals who are committed to excellence and advancing the capabilities that keep our nation safe and secure. Spear AI builds sonobuoy sensors that are deployed into the water and collect edge data. We also work with the U.S. Navy to collect and process their SONAR data. You'll have an opportunity to work on real-world projects that directly impact warfighter capabilities and mission success. What you'll do We're a small team wearing many hats, and you'd have a wide variety of responsibilities that include: • Design and engineer security architectures for program information systems, ensuring security is built in from the ground up rather than bolted on • Translate RMF, ICD 503, CNSSI 1253, and NIST SP 800-53 requirements into implemented, testable technical controls across multiple classified systems • Develop and maintain the body of evidence supporting ATO packages — system security plans, control implementation details, test results, and supporting artifacts — in partnership with the ISSM and ISSOs • Harden systems to DISA STIG and IC baselines; run and remediate vulnerability scans (ACAS/Nessus, SCAP) across the environment • Integrate security into the developmen