Mobile Infrastructure Engineer

About PolymarketPolymarket 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 RolePolymarket is looking for a Mobile Infrastructure Engineer to own mobile infrastructure end-to-end: the release pipeline, CI, test infrastructure, stability, and observability that let a small mobile platform team ship a high-traffic trading product quickly and safely. You'll also help build our AI layer — the harnesses, evaluations, and developer tooling that make AI a first-class part of how we build and ship mobile software.This is a generalist, hands-on role. You'll build and operate the tooling behind how the team ships — release automation, CI, test infrastructure, observability — and extend that toolchain with AI. The work spans services and code: alongside the pipelines and dashboards, you'll go into the app itself to fix crash clusters and harden error paths. We're looking for someone who has kept a high-traffic consumer mobile product shipping reliably.What You'll DoOwn the release tooling across iOS and Android: automated builds, code signing, store submission, phased rollouts, hotfix paths, and post-release health checks after every deploymentBuild and maintain CI infrastructure that earns trust: build-time budgets, flaky-test detection and quarantine, merge gates, and device and simulator infrastructure that keeps feedback loops shortBuild the quality tooling: regression gates and automated coverage that let the team set and defend crash-free and ANR targets — and go directly into app code to fix crash clusters and harden error paths when the tooling surfaces themRun the observability stack and alerting that surfaces problems before users feel themBuild AI into the mobile toolchain: create evaluation harnesses for AI-assisted features, embed AI agents into developer workflows, and make AI a first-class part of how the team ships and testsMeasure everything: set budgets, track them over time, and prove improvements with data rather than instinctWhat We're Looking ForBroad mobile infrastructure experience at consumer scale, including CI/CD, release automation, test infrastructure, and stability work on iOS, Android, or bothHands-on experience with mobile release tooling: crash reporting and monitoring with Sentry or similar, feature flagging with LaunchDarkly or similar, and release automation with fastlane or an equivalentPractical experience applying AI to engineering work: building evaluation harnesses, integrating LLM-powered features, or embedding AI agents into developer workflowsMeasurement-driven approach to quality — you instrument, set budgets, and prove improvements rather than operating on gut feelWillingness to go into app code when the tooling surfaces problems — you can fix crash clusters and harden error paths yourself while your core ownership stays the tooling and infrastructure around the appGeneralist temperament: comfortable owning the tooling for release, CI, quality, observability, and AI at the same time on a small team, and able to drive each area without heavy oversight(Plus) Familiarity with real-time data applications, live market feeds, or trading products on mobile(Plus) Background in fintech or other data-intensive consumer mobile productsBenefitsCompetitive salary & equityUnlimited PTOFull Health, Vision, & Dental coverage401k matchHardware setup: new MacBook Pro, big display, & accessoriesPay TransparencyBase salary range: $250,000 to $350,000 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.LocationNew YorkEmployment TypeFull timeLocation TypeOn-siteDepartmentEngineering