Senior iOS and Mac Software Engineer

About We're a stealth AI startup building an agentic AI product and assembling our founding team in LA/SF. We're pre-seed funded and heads-down until launch. Full details are shared under NDA once we connect. We offer competitive salary, relocation assistance, great benefits, and equity, and visa support. Description This role is for an iOS engineer who has owned an iPhone app end to end and delivered large assets, such as media, game content or ML models, to devices. It is not for you if your iOS work has been screens on top of someone else's networking, an SDK, a cross-platform framework, or delivery on the server side only. In this role, you will: - Build and own our iPhone app in SwiftUI, including secure sign-in, device pairing and approval flows, notifications, sync and offline behavior - Own delivery of large assets to our Mac and iPhone apps: the versioned catalog, the CI job that signs and publishes each release, background download and verification before use - Roll out each asset release in stages with automatic rollback and a switch to turn off a bad release - Keep the iPhone app within its memory, background and energy limits, measured with Instruments - Launch and maintain the iPhone app, from beta through App Store release and every release after: beta programs, phased rollouts, A/B experiments, and accountability for stability, performance and quality in production Minimum Qualifications - Ownership of production native iOS apps, written in Swift with SwiftUI, that shipped to customers (not an SDK or library inside other companies' apps) - Experience delivering large content to an iOS app, hundreds of megabytes or more, such as game assets, offline maps, media or ML models - Experience building a sign-in, device pairing or approval flow secured with keys in the Keychain or Secure Enclave and Face ID or Touch ID, including rejection of replayed requests - Experience launching and maintaining an iOS app in production, from a TestFlight beta through App Store release: phased releases or staged content rollouts, A/B experiments, and rolling back or switching off a bad release - 8+ years of professional software engineering experience, 4+ of them building iOS apps in Swift - Bachelor's degree in Computer Science, Computer Engineering or a related field Preferred Qualifications - Shipped an Apple app that loads ML models with Core ML or MLX: packaging models for download and loading them within the device's memory limit; Metal or Accelerate a plus - Built the publishing side of downloadable content: a versioned catalog or manifest, and a CI job that signs and publishes each release - Delivered the same downloadable content to a Mac app as well as an iPhone app - Background Assets or Apple-hosted asset packs - Network framework or Bonjour for communication between devices on a local network - Notification service extensions and rich notifications, with App Groups - Release automation through Xcode Cloud or fastlane - Deep experience with Instruments: memory-limit and energy investigations on iPhone