Senior Information Systems Security Engineer

Peraton is seeking a Senior ISSE to support our customer onsite in Washington D.C.

Design and implement secure technical architectures, including firewalls, encryption, and network defenses. Embed security into system development life cycles (SDLC).
• Lead the development of System Security Plans (SSPs), security control traceability matrices (SCTM), Security Impact Assessment (SIA)and vulnerability assessments to achieve ATOs.
• Mentor junior ISSOs/ISSEs and provide security expertise to engineering, operations, and leadership teams.
• Analyze systems to identify and mitigate risks.
• Oversee security controls and monitoring (CyberArk, Trellix ePO, Splunk, ACAS and Active Directory) to maintain compliance and detect anomalies.
• Maintain comprehensive security documentation and ensure compliance with NIST, FISMA, and DISA STIG standards
• Perform vulnerability scans, analyze risks, and track remediation efforts using tools like Splunk, Tenable, and Trellix.

• Minimum of 8 years with BS/BA; 12 years of work experience in lieu of a Bachelors Degree.
• Strong background in networking (TCP/IP, firewalls, VPNs), cloud security (AWS/Azure), Kubernetes, and DevSecOps.
• Deep understanding of NIST SP 800-161, NIST RMF, FedRAMP, Common Criteria, ATO package development, and cybersecurity compliance (STIGs).
• Hands-on experience managing and deploying ACAS, SCAP, HBSS, and CyberArk tools
• Proven experience in leading projects and mentoring junior ISSE's.
• Present technical briefings to leadership.
• Must have a current DoD 8570.1-M IAT Level III certification (SecurityX (CASP), GCIH, CISA, CISSP)
• Must possess an active Top Secret with SCI eligibility

Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can't be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we're keeping people around the world safe and secure.