Imagine what you could do here. At Apple, new ideas have a way of becoming extraordinary products, services, and customer experiences very quickly. Bring passion and dedication to your job and there's no telling what you could accomplish. We’re looking for a passionate software engineer to drive Contacts frameworks and syncing on iOS & macOS! Contacts is essential infrastructure adopted by virtually every app that interacts with people. Beyond powering every phone call, message, and email, our frameworks are used by third-party developers, enterprise apps, and system services to manage and access user relationships. From your Calendar invites to your calling experiences, from Photos people recognition to your favorites, Contacts is there, working behind the scenes to create seamless experiences. In this role, you will build the foundations of Apple’s communication user experiences, with high potential to innovate: - Driving contacts sync reliability to 99.999% with CloudKit & CardDAV. - Upholding Apple’s privacy ideals through the use of strong encryption and data protection. - Designing API to efficiently and expressively manage people, relationships, and communication preferences. In this role, your responsibilities will include: - Designing, implementing, and maintaining Contacts database storage, sync, and frameworks. - Working mostly in Swift and Objective-C on protocols, frameworks, and daemons. - Learning from and mentoring peer engineers. - Planning and delivering cross-functional work with partner teams, including the Phone app team, CloudKit team, and Contacts Server team. This team has a duty to shape and drive Apple’s communication user experiences. We fulfill our duty by caring deeply, living on our software, developing defensible opinions on what to keep / what to change, and having empathy for the countless users across the world who rely on us every day.