Senior Software Engineer, iOS

Every day, tens of millions of people come to Keystone AI to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At Keystone AI, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Keystone AI means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. The Consumer Platform team owns the mobile app foundation that makes Keystone AI feel fast, fluid, and reliable for millions of players and is dedicated to delivering superior performance, reliability, and user experience on all platforms Keystone AI runs on. This team ensures a seamless and engaging user interface that facilitates intuitive interactions, alongside maintaining high performance and reliability for efficient, glitch-free operations. Innovation is at the core of our work, as we continuously enhance features and integrate cutting-edge technologies to find novel solutions to problems. We're hiring an exceptional iOS engineer to help us push the bar even higher. You will: Shape & improve the iOS experience that millions of players open every day. Lead architecture and implementation on a large, evolving Swift/Objective-C codebase, making decisions that hold up across years of product growth. Push the platform forward by adopting the latest iOS, hardware, and iOS capabilities. Partner deeply with product, design, and data science to materialize ideas. Raise the engineering bar through code review, technical mentorship, and the standards you set in your own work. (Principal) Set technical direction across multiple workstreams, drive multi-quarter initiatives that span teams, and act as a force multiplier for the broader iOS platform. You have: 5+ years of track record of leading the design and delivery of mobile features at scale. BS/MS in Computer Science, Engineering, or equivalent practical experience. Deep, hands-on expertise in Swift and Objective-C, with a real point of view on modern iOS architecture (Swift Concurrency, SwiftUI/UIKit interop, modularization). Experience working in very large codebases with many contributors — you know how to ship safely, instrument well, and keep build times sane. Strong product sense. You can tell the difference between an interaction that's correct and one that feels right, and you fight for the latter. Excellent judgment under ambiguity, and a bias toward shipping over speculating. Nice to have: Cross-platform development with C++ and low-level hardware APIs. Experience with rendering, graphics, or game-engine-adjacent systems. Contributions to open source, conference talks, or technical writing in the iOS community. Experience integrating on-device or server-side generative AI into consumer products. For roles that are based at our headquarters in San Mateo, CA: The starting base pay for this position is as shown below. The actual base pay is dependent upon a variety of job-related factors such as professional background, training, work experience, location, business needs and market demand. Therefore, in some circumstances, the actual salary could fall outside of this expected range. This pay range is subject to change and may be modified in the future. All full-time employees are also eligible for equity compensation and for benefits as described on this page . Annual Salary Range $295,250 — $345,040 USD Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted). Keystone AI provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Keystone AI also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process. For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.