Paraxial is building the first AI-native optical design platform, a modern successor to legacy tools like Zemax and Code V. Optical systems drive AR/VR, LiDAR, robotics, aerospace, and biomedical imaging - yet the tools used to design them are outdated, slow, and fundamentally incompatible with modern compute and AI. We're rebuilding the stack from first principles: natural-language spec-to-model, high-performance ray tracing, intelligent design exploration, hybrid AI tolerancing, and CAD-native integration. With hundreds of optical engineers already on the waitlist and enterprise design partners ready to begin pilots, we're hiring a CTO to architect and ship the beginning of the platform. This is a hands-on technical leadership role. You will build the first working iteration of Paraxial, make the architectural decisions that define its long-term future, and grow the engineering organization around your technical vision.