Senior Software Engineer, Predictions – Mobile

Gemini

Senior Mobile Engineer at Gemini building mobile interfaces for prediction markets. Collaborating with teams to enhance trading experiences in a regulated environment.

Posted 7/9/2026full-timeNew York City • California, New York, Washington • 🇺🇸 United StatesSenior💰 $140,000 - $200,000 per yearWebsite

Tech Stack

Tools & technologies

GRPCJavaScriptReactReact NativeTypeScript

About the role

Key responsibilities & impact

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.

Requirements

What you’ll need

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.

Benefits

Comp & perks

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

ATS Keywords

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Hard Skills & Tools

React NativeTypeScriptGRPCWebSocketPerformance ProfilingDebuggingUnit TestingIntegration TestingMobile Application DevelopmentData-Intensive UI

Soft Skills

CollaborationMentoringProblem-SolvingCommunication