This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Software Engineer - Clearance Required based in United States. This senior engineering role combines hands-on software development with technical leadership across a modern full-stack platform. You will guide engineers, shape architecture, and help deliver secure, scalable applications for mission-critical government users. The role spans responsive frontend experiences, backend services, API architecture, data models, testing, and deployment automation. You will work closely with product, design, DevSecOps, and field teams to rapidly turn requirements into production-ready capabilities. As part of an AI-enabled development environment, you will establish guardrails and validation practices that keep AI-assisted engineering reliable and secure. The position offers the opportunity to influence technical direction while remaining deeply involved in coding, system design, and problem-solving. An active Secret clearance is required, making this an ideal opportunity for an experienced engineer motivated by high-impact government missions.