Responsibilities

Build and ship React Native mobile features end-to-end across Sekai’s core consumer experience
Work on high-impact product surfaces such as feed, discovery, creation, play experience, sharing, onboarding, retention, and user engagement
Improve mobile app performance, stability, responsiveness, and overall product quality
Debug and fix production issues quickly, with strong judgment around user impact and prioritization
Collaborate closely with Product, Design, Backend, and Growth to turn product ideas into shipped mobile experiences
Integrate React / web-based interactive content into the mobile app experience where needed
Use analytics, logs, crash reports, and user feedback to identify and solve mobile product issues
Use AI aggressively in day-to-day development, debugging, prototyping, testing, and iteration
Help shape Sekai’s long-term mobile architecture as the product scales

Qualifications

3+ years of professional software engineering experience, ideally with mobile or consumer-facing products
Strong hands-on experience with React Native
Strong proficiency with TypeScript / JavaScript
Experience shipping production mobile apps on iOS and/or Android
Good understanding of mobile app architecture, navigation, state management, API integration, release cycles, and app store deployment
Strong product sense and care for user experience, especially on mobile
Able to debug issues independently and move quickly from problem discovery to shipped fix
Highly AI-native, with strong familiarity using modern AI coding tools such as Cursor, Claude Code, Codex, or similar tools
Strong ownership mindset and ability to drive work end-to-end
Comfortable working in a fast-paced startup environment with ambiguity

Experience with Android Native development, especially Kotlin, Java, Android SDK, or Jetpack Compose
Experience optimizing Android performance, including startup time, scrolling performance, memory usage, crash rate, ANR, and low-end Android device performance
Experience building or maintaining hybrid mobile architectures, including React Native + native modules, WebView integration, or native bridges
Experience with Flutter, especially migrating from Flutter to React Native or maintaining apps across multiple mobile stacks
Experience with mobile-first consumer products, social products, UGC platforms, gaming, entertainment, creator tools, or feed-based apps
Experience with mobile analytics, crash reporting, and performance tools such as Firebase, Amplitude, GA4, Sentry, Datadog, Android Studio Profiler, or similar tools
Experience at an early-stage startup or high-growth consumer company
Strong side projects, open-source contributions, or independently shipped apps are a plus