Founding iOS Engineer

Sekai•San Francisco, CA

12h•Remote

About The Position

Sekai is building the TikTok for mini apps — an AI-driven consumer platform where people create, remix, share, and play interactive content instantly. We are a Series A company backed by Khosla, a16z, Mayfield, and A, with $30M raised to date. We are remote-first across all positions and are looking for ambitious, AI-native builders who want to help shape the next generation of consumer social products. About the Role We are looking for a Senior iOS Engineer to own Sekai’s iOS app and help us build a fast, polished, AI-native consumer experience. This role is for someone with strong iOS experience, good consumer product taste, and the ability to move quickly in a startup environment. You should keep up with the latest Apple platform updates, understand what great mobile apps feel like, and be excited to use AI to rethink how fast a small team can build. You will work closely with Product, Design, Backend, and Mobile engineers to improve the iOS app experience, ship new features, and help define our AI-native mobile development workflow.

Requirements

Strong professional experience building and shipping iOS apps
Deep familiarity with Swift, iOS SDK, and modern iOS development practices
Experience working on consumer mobile apps with high standards for UX, performance, and reliability
Experience owning projects end-to-end in a startup, 0-to-1 product environment, or similarly fast-moving team
AI-native mindset: you actively use AI tools to build faster, explore better implementation paths, and improve engineering productivity
Strong product sense and willingness to work closely with design and product teams

Nice To Haves

Experience with social, entertainment, creator, gaming, UGC, or feed-based consumer products
Experience with React Native, Flutter, WebView, or other hybrid mobile architecture
Familiarity with Android, backend systems, or full-stack product development
Experience working on AI-native products or teams that heavily use AI in day-to-day development

Responsibilities

Own and improve Sekai’s iOS app experience, quality, and release velocity
Build and ship consumer-facing iOS features with strong attention to speed, polish, and reliability
Bring modern iOS best practices and the latest Apple platform knowledge to the team
Work across native iOS, hybrid mobile, and web-based app experiences when needed
Partner closely with Product, Design, Backend, and Mobile engineers to move from idea to shipped product quickly
Use AI development tools to accelerate coding, debugging, refactoring, and product iteration