We work on the device side of iCloud, building frameworks such as CloudKit and NSUbiquitousKeyValueStore that provide the foundations for secure and private cloud storage and computation. This position will involve close collaboration with engineers across Apple, covering dependencies below our frameworks and adopters above them. This job entails systems programming tasks such as synchronization protocol design, IPC, multi-process performance considerations, and API design. Reliability is essential, and we’re looking for engineers who are passionate about building complex systems that will seamlessly recover in the event of errors. In this role, you will: • Work with adopters to craft flexible and ergonomic APIs • Work with OS partners to build performant architectures • Work with our server counterparts to design scalable features and protocols • Work with teammates to help maintain and evolve test automation