Sr. Mobile iOS Engineer

xAI•Palo Alto, NY

About The Position

SpaceXSI is seeking an exceptional iOS engineer to join a small, high-impact team building X for iOS, an app used by millions of people to see what's happening and participate in the global town square. The engineer will work in a fast-paced environment and take ownership of continually improving the app, from developing new features to making micro-optimizations.

Requirements

At least 5 years of experience with Swift and UIKit.

Nice To Haves

Deep expertise in the Apple ecosystem and related development tools.
A track record of shipping standout apps or standout features within apps.
Deep expertise in iOS development, particularly with Swift.
Ability to deliver results quickly and decisively.
Strong product sense, empathy for users, and ability to anticipate their needs and translate them into valuable features.
Proficiency in performance optimization across memory, CPU, and GPU, using low-level tools.
Experience designing and shipping intuitive, pixel-perfect mobile UIs.
Skill in concurrency and reactive programming with Combine.
Experience building high-throughput integrations with APIs or AI model outputs.
Ability to own complex features end-to-end, from architecture through App Store deployment, with a focus on speed and scalability.

Responsibilities

Craft intuitive user experiences that redefine how people interact with the app.
Pay close attention to pixels, animations, and interactions to create a seamless experience.
Build highly performant systems.
Drive technical and product decisions in collaboration with designers and backend, Android, and web engineers.
Own product quality, including running A/B tests, identifying issues, and proactively making improvements.
Find ways to improve the app based on user feedback and personal experience using it.