Senior Android Engineer

About PolymarketPolymarket is the world's largest prediction market platform. We enable individuals to express views on real-world events by trading on outcomes across politics, economics, sports, culture, and current affairs. Built as a peer-to-peer marketplace with no centralized "house," Polymarket aggregates diverse opinions into transparent, market-based probabilities that reflect collective expectations about the future.We're growing fast — both in terms of volume ($21B traded in 2025) and adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media and we need your help adding fuel to the fire.About the RolePolymarket is looking for a Senior Android Engineer to help build a world-class trading app on Android. Millions of users follow markets, track positions, and make trades on their phones — and the Android experience needs to match that level of engagement.This is a high-ownership role for someone who understands what it takes to build a great trading or wagering experience on mobile: the performance requirements, the real-time data challenges, the UI patterns that make fast-moving information feel intuitive rather than overwhelming. You'll raise the bar across the Android codebase and help take a product that's already at scale to the next level.What You'll DoBuild and own Android features spanning payments flows, real-time market data, and core UI with full accountability from design handoff through to productionImplement polished, performant interfaces with Jetpack Compose that hold up under real trading conditions and meet a high bar for feel and reliabilityContribute to CI/CD pipelines and Gradle configuration so the team can ship with confidence and without frictionBuild and maintain integrations across WebSockets, gRPC, and streaming data to power the live market features traders depend onCollaborate effectively with a distributed team, communicate clearly across time zones, and make good decisions without needing close oversightActively incorporate AI tools into your development workflow to move faster and maintain a high output barIdentify gaps in Android architecture and engineering practices and surface them early, before they become problems at scaleWhat We're Looking ForStrong, current experience with Kotlin — the kind where you can speak concretely to tradeoffs and have opinionsStrong, current experience building UI with Jetpack Compose in production appsPractical experience contributing to CI/CD pipelines and managing Gradle build configurationSolid understanding of modern Android architecture and the ability to make sound decisions across it without being hand-heldActive use of AI tools in your development workflow — not occasionally, but as a real part of how you work(Plus) Experience integrating payments on Android(Plus) Experience with WebSockets, gRPC, or other real-time data patterns on mobile(Plus) Familiarity with cross-platform shared-code architectures(Plus) iOS or Swift experience(Plus) Background at a larger, more mature engineering organization where you saw practices evolve as the company grewBenefitsCompetitive salary & equityUnlimited PTOFull Health, Vision, & Dental coverage401k matchHardware setup: new MacBook Pro, big display, & accessoriesLocationNew YorkEmployment TypeFull timeLocation TypeOn-siteDepartmentEngineering