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About Polymarket
Polymarket 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 Role
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.
What You'll Do
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
What We're Looking For
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
(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 grew
Benefits
Competitive salary & equity
Unlimited PTO
Full Health, Vision, & Dental coverage
401k match
Hardware setup: new MacBook Pro, big display, & accessories
Is Kotlin a good career?
Yes, Kotlin is a good career choice for developers who want to work in the Android app development, backend development, or cross-platform development space
Kotlin is a modern programming language that was designed to improve upon some of the shortcomings of Java, making it more concise, safe, and interoperable with other languages
Here are some reasons why Kotlin is a good career choice:
- High Demand: Kotlin is in high demand in the technology industry, especially in the Android app development space. Many companies are now using Kotlin to develop their Android apps, and the demand for Kotlin developers is growing rapidly.
- Compatibility: Kotlin is interoperable with Java, which means that developers can use both languages in the same project. This makes it easy for developers to migrate from Java to Kotlin and vice versa, and it also makes it easier to integrate Kotlin into existing Java-based projects.
- Easy to Learn: Kotlin is relatively easy to learn for developers who are already familiar with Java or other similar programming languages. Kotlin has a simpler syntax than Java, making it easier to read and write code.
- Concise and Safe: Kotlin is a more concise language than Java, which means that developers can write less code to achieve the same functionality. Additionally, Kotlin has built-in null safety features that help developers avoid common errors and bugs.
- Career Growth: Kotlin is a relatively new language, which means that there is a lot of room for growth and innovation. Developers who are proficient in Kotlin have the opportunity to contribute to the development of the language and its ecosystem, which can lead to career growth and advancement.