sekai - Mobile Engineer — React Native
Requirements
• 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
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
Benefits
• Top-tier salary in the market + competitive equity • Full health insurance • Remote-first team • If you are excited about building at the frontier of AI, consumer social, and interactive entertainment, we would love to hear from you. • At Sekai, you will work with an AI-native team, move fast, own meaningful problems, and have the flexibility to explore new ideas from an early stage.
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