Sr. Mobile iOS Engineer

SpaceXSI•Palo Alto, CA

2d•$180,000 - $330,000

About The Position

SpaceXSI is seeking an iOS engineer to join a small, high-impact team building X for iOS, an app used by millions of people. 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. The role involves building intuitive, polished, high-performance experiences and contributing to technical and product decisions across disciplines.

Requirements

At least 5 years of experience in Swift and UIKit.

Nice To Haves

Deep expertise in the Apple ecosystem and related development tools.
Track record of shipping standout apps or standout features within apps.
Deep expertise in iOS development, particularly with Swift.
Ability to deliver results swiftly and decisively.
Strong product sense, with the ability to empathize with users, anticipate their needs, and translate them into valuable features.
Proficiency in optimizing memory, CPU, and GPU performance 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 to App Store deployment, with a focus on speed and scalability.

Responsibilities

Craft delightful, intuitive user experiences for the app.
Refine 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, finding issues, and proactively making improvements.
Identify opportunities to improve the app using user feedback and personal experience with it.