The iCloud Mail, Calendar & Contacts Client Engineering team is seeking a Client Software Engineer to develop exceptional products and user experiences for iCloud Mail across iOS, macOS, and the Web. This role involves crafting user interfaces, client frameworks, and integrating client-device and cloud domains. The engineer will be responsible for maintaining the technology stack, creating new functionality, and building comprehensive unit and end-to-end tests. The ideal candidate thrives on collaboration, writes functional specifications, and prioritizes quality, aiming to create efficient, testable, and maintainable code for a billion users.