Mission-Critical Full-Stack Developer (TS/SCI)

Sphinx LLC is seeking a senior Full-Stack Software Developer to design, develop, and maintain mission-critical applications for internal teams and federal customers. You will work across front-end interfaces with React, Vite, and MUI, back-end services with Node/Express and PostgreSQL, and integrate shared tooling with TypeScript in both corporate and classified environments. This role requires an active TS/SCI clearance with CI Poly, U.S.