Senior Android Engineer

Polymarket•New York, NY

About The Position

Polymarket 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.

Requirements

Strong, current experience with Kotlin — the kind where you can speak concretely to tradeoffs and have opinions
Strong, current experience building UI with Jetpack Compose in production apps
Practical experience contributing to CI/CD pipelines and managing Gradle build configuration
Solid understanding of modern Android architecture and the ability to make sound decisions across it without being hand-held
Active use of AI tools in your development workflow — not occasionally, but as a real part of how you work

Nice To Haves

Experience integrating payments on Android
Experience with WebSockets, gRPC, or other real-time data patterns on mobile
Familiarity with cross-platform shared-code architectures
iOS or Swift experience
Background at a larger, more mature engineering organization where you saw practices evolve as the company grew

Responsibilities

Build and own Android features spanning payments flows, real-time market data, and core UI with full accountability from design handoff through to production
Implement polished, performant interfaces with Jetpack Compose that hold up under real trading conditions and meet a high bar for feel and reliability
Contribute to CI/CD pipelines and Gradle configuration so the team can ship with confidence and without friction
Build and maintain integrations across WebSockets, gRPC, and streaming data to power the live market features traders depend on
Collaborate effectively with a distributed team, communicate clearly across time zones, and make good decisions without needing close oversight
Actively incorporate AI tools into your development workflow to move faster and maintain a high output bar
Identify gaps in Android architecture and engineering practices and surface them early, before they become problems at scale