Mobile iOS Engineer
iOS engineer on a small team at SpaceX Super Intelligence building the Grok AI mobile app, crafting pixel-perfect, high-performance experiences for interacting with AI on mobile and owning features end-to-end from architecture to App Store release. Core stack: Swift, SwiftUI, UIKit, Combine, with REST/gRPC integrations.
- Compensation
- £107K–£262K / yr
- Location
- London, United Kingdom
- Work setup
- Not specified
- Seniority
- Not specified
- Employment
- Not specified
- Experience
- Not specified
- Category
- Mobile
- Posted
Skills
Must have
- Expert in Swift, with deep knowledge of SwiftUI and UIKit
- Proficient in performance optimization—memory, CPU, GPU—using low-level tools
- Experienced in designing and shipping intuitive, pixel-perfect mobile UIs
- Skilled in concurrency and reactive programming (Combine)
- Experience building high-throughput integrations with APIs (REST, gRPC) or AI model outputs
- Able to own complex features end-to-end, from architecture to App Store deployment
Nice to have
- Deep expertise in the Apple ecosystem and related development tools
- Rust for working with backend components
- AVFoundation for real-time audio processing
- Track record of shipping standout apps or standout features within apps
- Deep expertise in iOS development, particularly with Swift, operating at the highest level of craft
- Ability to deliver results swiftly; speed is a core value
- Sharp product sense: empathizing with users and translating needs into delightful features
Full description
SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
ABOUT THE ROLE:
We’re seeking an exceptional iOS engineer to join a small, high-impact team dedicated to creating the world’s most valuable AI application, judged by the impact it delivers to users. You’ll shape cutting‑edge mobile experiences, blending technical mastery with product brilliance.
RESPONSIBILITIES:
- Dream up and craft delightful, intuitive user experiences that redefine how people interact with AI on mobile.
- Obsess over every pixel, animation, and interaction, ensuring the experience feels magical and seamless.
- Build blazing‑fast, highly performant systems where every millisecond counts.
- Drive technical and product decisions, collaborating with AI researchers and engineers to deploy state‑of‑the‑art models globally.
BASIC QUALIFICATIONS:
- Expert in Swift, with deep knowledge of SwiftUI and UIKit.
- Proficient in performance optimization—memory, CPU, GPU—using low‑level tools to deliver blazing‑fast systems.
- Experienced in designing and shipping intuitive, pixel‑perfect mobile UIs that redefine how users interact with AI.
- Skilled in concurrency and reactive programming (Combine) for responsive, real‑time apps.
- Built high‑throughput integrations with APIs (REST, gRPC) or AI model outputs, ensuring seamless data flow.