Staff iOS Engineer

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 Staff iOS Engineer to help set the technical direction for our iOS product. 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, and the UI patterns that make fast-moving information feel intuitive rather than overwhelming.

You’ll partner with product, design, and engineering leadership to define the long-term vision for iOS at Polymarket, drive the architectural decisions behind it, and raise the bar for engineering quality across the mobile org. The right person has been in this world before. They know what a great trading or sportsbook app feels like from the inside, they’ve led the technical strategy behind one, and they want to build something better.

What You’ll Do

Own the technical vision and long-term roadmap for Polymarket’s iOS platform, from architecture and performance to product quality and release discipline

Drive foundational architectural decisions that make the codebase scale with the product and the team, and see them through end to end

Lead the design of systems that handle live market data, fast-moving prices, and real-time order state reliably and at scale

Set iOS engineering standards and best practices, and level up the broader mobile team through code reviews, design reviews, and mentorship

Partner with backend, product, and design leadership to shape APIs, data contracts, and cross-platform technical strategy

Identify and tackle the hardest technical problems across mobile, including performance bottlenecks, reliability gaps, and infrastructure investments

Act as a technical leader and multiplier, influencing direction beyond your own code and helping shape how Polymarket builds mobile as a platform

What We’re Looking For

Extensive iOS engineering experience, with a track record of leading the architecture of high-quality iOS applications in production at scale

Deep experience building trading, financial, sportsbook, or adjacent real-time products. You understand the domain and the technical demands that come with it

Expert knowledge of Swift and the iOS SDK, with strong instincts around performance, memory management, concurrency, and real-time data handling

Proven experience designing apps that consume live data feeds and display fast-moving information reliably and smoothly

Experience setting technical direction across a team or multiple teams, and driving alignment on complex architectural decisions

A track record of mentoring engineers and raising the technical bar of the teams around you

A high bar for product quality. You care about how things feel, not just whether they work

Comfortable operating with broad ownership and ambiguity in a fast-moving environment

Strong cross-functional communication skills, including the ability to influence product, design, and backend leadership

(Plus) Familiarity with WebSockets, streaming APIs, or other real-time data infrastructure

(Plus) 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

Pay Transparency

Base salary range: $250,000 to $500,000 annually, plus equity and benefits.

This range reflects a good-faith estimate for this position. Experience levels vary widely within a title here, so please reach out even if your expectations fall outside it. We're always happy to chat.