Staff iOS Engineer

Polymarket•New York, NY

About The Position

Polymarket is looking for a Staff 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.

Requirements

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

Nice To Haves

Familiarity with WebSockets, streaming APIs, or other real-time data infrastructure
Experience leading or mentoring iOS engineers
Background in a high-growth startup environment

Responsibilities

Own the iOS product. Take end-to-end ownership of Polymarket's iOS experience, from technical architecture and performance to product quality and release discipline.
Set the technical direction. Make and own architectural decisions for the iOS platform, ensuring the codebase is built to scale and maintained with rigor as the product grows.
Build for real-time. 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.
Raise the engineering bar. Lead code reviews, establish strong iOS engineering standards, and help grow the capability of the broader mobile team.
Partner across the company. 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.
Contribute to mobile strategy. Help shape how Polymarket thinks about mobile as a platform, including architecture decisions that set up the team for scale.