Senior iOS Engineer

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.

Responsibilities

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

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 have

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

Benefits

Competitive salary & equity; Unlimited PTO; Full Health, Vision, & Dental coverage; 401k match; Hardware setup: new MacBook Pro, big display, & accessories