{"id":3778833,"url":"https://alion.io/job/xai-sr-mobile-ios-engineer","title":"Sr. Mobile iOS Engineer","company":{"id":28,"name":"xAI","domain":"x.ai","url":"https://alion.io/company/xai","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":82,"open_postings":89,"ghost_share":0,"stale_share":0.517,"repost_share":0,"time_to_fill_p50_days":64,"computed_at":"2026-11-08T05:47:12Z"}},"role":"Mobile","role_family":"Mobile","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Palo Alto, United States","New York, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":375000,"max":null,"currency":"USD","period":"year","gross":null,"usd_annual":375000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"A/B Testing","optional":false},{"name":"Swift","optional":false},{"name":"UIKit","optional":false},{"name":"Combine","optional":true},{"name":"Reactive Programming","optional":true}],"status":"closed","first_seen_at":"2026-11-04T23:41:00Z","employer_posted_date":"2026-11-04","last_verified_at":"2026-11-06T10:02:00Z","board_verified":false,"closed_at":"2026-11-06T10:02:00Z","days_open":1,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":1},"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.\nSpaceXSI 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.\nSR. MOBILE IOS ENGINEER\nWe're seeking an exceptional iOS engineer to join a small, high-impact team building X for iOS, the app millions of people use every day to see what's happening and join the global town square. You’ll work in a fast paced environment and take ownership of constantly improving the app; from groundbreaking new features to micro optimizations.\nRESPONSIBILITIES:\nCraft delightful, intuitive user experiences that redefine how people interact with the app\nObsess over every pixel, animation, and interaction, ensuring the experience feels magical and seamless\nBuild blazing-fast, highly performant systems where every millisecond counts\nDrive technical and product decisions, collaborating with designers, backend, android and web engineers\nOwn the quality of the products you build - including running a/b tests, finding issues, and proactively making improvements\nBe proactive in finding ways to improve the app - from user feedback and from your own daily experience on the app\nBASIC QUALIFICATIONS:\nExperience in Swift and UIKit\nPREFERRED SKILLS AND EXPERIENCE:\nDeep expertise in the Apple ecosystem and related development tools\nTrack record of shipping standout apps or standout features within apps\nDeep expertise in iOS development, particularly with Swift. We seek individuals who operate at the highest levels of their craft\nExcel at delivering results swiftly, often in a fraction of the time others require. Speed is a core value at SpaceXSI-we must act decisively to succeed\nA sharp product sense, with an ability to empathize with users, anticipate their needs, and translate that into features that delight and deliver value\nProficient in performance optimization-memory, CPU, GPU-using low-level tools to deliver blazing-fast systems\nExperienced in designing and shipping intuitive, pixel-perfect mobile UIs that redefine how users interact with UI’s\nSkilled in concurrency and reactive programming (Combine) for responsive, real-time apps\nBuilt high-throughput integrations with APIs or AI model outputs, ensuring seamless data flow.\nCapable of owning complex features end-to-end, from architecture to App Store deployment, with a focus on speed and scalability\nCOMPENSATION AND BENEFITS:\n$200,000 - $375,000 USD\nBase salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.\nSpaceXSI is an equal opportunity employer. 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