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# iOS Engineer

- **Company:** POLYMARKET CLEARING LLC
- **Location:** New York, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), IOS Applications, Apple IOS, Code Review, Memory Management, IOS SDK, Ui Patterns, Data Streaming, WebSocket, Backend, Real Time Data
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/senior-ios-engineer-polymarket-8060501

## About the Role

* Significant iOS engineering experience, with a track record of shipping and owning high-quality iOS applications in production
 * Deep experience building trading, financial, or sportsbook applications - you understand the product domain and the technical demands that come with it
 * Strong knowledge of Swift and the iOS SDK, with solid instincts around performance, memory management, and real-time data handling
 * Experience building apps that consume live data feeds and display fast-moving information reliably and smoothly
 * A high bar for product quality - you care about how things feel, not just whether they work
 * Comfortable operating with broad ownership in a fast-moving environment
 * Strong cross-functional communication skills - you work well with product, design, and backend engineers
 * (Plus) Familiarity with WebSockets, streaming APIs, or other real-time data infrastructure
 * (Plus) Experience leading or mentoring iOS engineers
 * (Plus) Background in a high-growth startup environment

## Description

Polymarket is looking for a Senior iOS Engineer to help build our iOS product as we invest seriously in mobile. 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 work closely with product, design, and engineering leadership to deliver a high-quality iOS experience and help raise the bar across the mobile codebase. The right person has been in this world before: they know what a great trading or sportsbook app feels like from the inside, and they want to build something better., * Take end-to-end ownership of Polymarket's iOS experience, from technical architecture and performance to product quality and release discipline

 * Make and own architectural decisions for the iOS platform, ensuring the codebase is built to scale and maintained with rigor as the product grows
 * Design and implement experiences that handle live market data, fast-moving prices, and real-time order state in a way that feels fast and reliable to users
 * Lead code reviews, establish strong iOS engineering standards, and help grow the capability of the broader mobile team
 * Work closely with product, design, and backend teams to align on priorities, define APIs and data contracts, and ship high-quality experiences end-to-end
 * Help shape how Polymarket thinks about mobile as a platform, including architecture decisions that set up the team for scale


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