Note: The job is a remote job and is open to candidates in USA. Gemini is a global crypto and Web3 platform offering a wide range of crypto products and services. The Senior Mobile Engineer will own the mobile experience for Gemini's prediction markets exchange, building trading interfaces and collaborating with various teams to enhance the mobile application.
Responsibilities
- Build and maintain the Predictions mobile trading experience end-to-end: market browsing, order placement, portfolio views, and settlement flows
- Architect performant, real-time UI for streaming market data (orderbook, price charts, position P&L) using modern React Native patterns (TurboModules, JSI, native navigator integration)
- Collaborate with backend engineers on gRPC and WebSocket integrations that power live trading surfaces
- Create reusable, well-tested UI components shared across Predictions and the broader Gemini mobile app
- Partner with product and design to shape mobile-specific UX for new contract categories (weather, economics, crypto, sports) and features like combo contracts and range contracts
- Scope and implement solutions independently, making informed architecture decisions and tradeoffs around native vs. JS boundaries
- Establish and improve mobile development processes — testing strategy, release quality gates, OTA vs. native release decisions
- Conduct thorough code reviews and mentor other engineers on React Native best practices
- Use analytics and experimentation data to inform product and engineering decisions around activation funnels, onboarding, and trading engagement
Skills
- 6+ years of software engineering experience, including 4+ years building production mobile applications with React Native
- Strong proficiency in TypeScript
- Deep understanding of React Native internals — bridging, native modules, performance profiling, and debugging
- Experience building real-time, data-intensive UIs (trading, dashboards, live feeds)
- Strong UX/UI sensibility with a track record of contributing to design and product decisions, not just implementing specs
- Expertise in unit and integration testing for mobile
- Comfort working in a regulated environment where changes require rigor and auditability
- Experience with financial or trading applications (orderbooks, charting, position management)
- Familiarity with Expo, EAS, and OTA update strategies
- Experience with native module authoring (Swift/Kotlin) or SwiftUI/Jetpack Compose embedding via Expo Modules API
- Exposure to gRPC, WebSockets, or similar real-time transport protocols
- Experience with performance analysis tooling (Flipper, React DevTools profiler, native instruments)
- Prior work at a fintech, exchange, or other regulated product environment
Benefits
- Competitive starting pay
- A discretionary annual bonus
- Long-term incentive in the form of a new hire equity grant
- Comprehensive health plans
- 401K with company matching
- Paid Parental Leave
- Flexible time off
- Hybrid work approach at our hub offices
- Remote workforce
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