Apple services and platforms face evolving security threats, from cloud vulnerabilities to application layer attacks, that require scalable, effective security solutions. We are looking for a Principal Security Software Engineer to tackle complex security problems across our datacenter and public cloud-based infrastructure and services, translating emerging threats into concrete defenses. In this role, you'll solve critical security challenges by identifying, designing, and implementing innovative solutions that protect our systems and services while enabling engineers to build quickly and safely. This role combines deep engineering problem-solving with cross-functional collaboration and technical leadership to embed security into everything we build.