Senior Mobile Engineer, Predictions - Real-Time Trading(RN)

Gemini; Miami (FL); Hybrid; USD 150,000 - 200,000; Full time

Benefits offered by this job

Competitive starting pay

Discretionary annual bonus

New hire equity grant

Comprehensive health plans

401K with company matching

Paid Parental Leave

Flexible time off

Job summary

Gemini is seeking a Senior Mobile Engineer for the Predictions team to own the mobile experience in its regulated prediction markets exchange. You will build trading interfaces for event contracts (binary, range, combo) within Gemini's React Native app.

Collaborate across product, design, backend, and compliance to ship new contract types and drive activation and retention on mobile. You will lead end-to-end mobile features, ship reusable UI components, and mentor teammates while ensuring

Qualifications

• 6+ years of software engineering experience, including 4+ years building production mobile apps with React Native.
• Strong proficiency in TypeScript.
• Deep understanding of React Native internals — bridging, native modules, performance profiling, and debugging.
• 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.

Responsibilities

• Build and maintain the Predictions mobile trading experience end-to-end: market browsing, order placement, portfolio views, and settlement flows.
• 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

TypeScript

React Native

gRPC & WebSocket

Mobile UI/UX

Unit & integration testing

Regulated environment

Tools

Expo / EAS

Swift/Kotlin bridging

OTA updates

Performance profiling

Job description

Gemini is seeking a Senior Mobile Engineer for the Predictions team to own the mobile experience in its regulated prediction markets exchange. You will build trading interfaces for event contracts (binary, range, combo) within Gemini's React Native app.

Collaborate across product, design, backend, and compliance to ship new contract types and drive activation and retention on mobile. You will lead end-to-end mobile features, ship reusable UI components, and mentor teammates while ensuring