KBR's National Security Solutions team is seeking a Senior Software Engineer to join their mission-critical cybersecurity operations in McLean, Virginia. This role combines advanced technology solutions with national security objectives, requiring expertise in secure system development, cloud engineering, and various programming languages. The position demands a professional with 10+ years of experience and an active TS/SCI clearance with Polygraph, who will work on innovative projects at the forefront of engineering and cybersecurity solutions. The role offers comprehensive benefits including healthcare, 401k matching, and professional development opportunities. As part of KBR's team of 29,000 global employees, you'll contribute to projects that directly impact national security while working in a collaborative environment that values integrity, empowerment, and team success. The position involves moderate travel (20-50%) and requires expertise in multiple technologies including AWS, various programming languages, and security-controlled systems.