Staff 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 RoleThe growth engineering team at Polymarket owns the systems that bring new users in and keep them moving through the product — onboarding, referrals, user acquisition flows. These are high-stakes surfaces where a broken pipeline or a slow API doesn't just generate an incident ticket; it costs us real users at real scale.This is a senior IC role with a lot of autonomy and very little hand-holding. You'll design, build, and maintain the infrastructure layer that gives the growth team a stable, scalable surface to work on — so they can move quickly without stepping on landmines. You'll define what needs to be hardened, when to push back on shipping velocity in favor of correctness, and how to instrument systems before problems reach production.What You'll DoDesign and maintain the infrastructure layer that growth engineers build on top of, including onboarding flows, referral systems, and user acquisition pipelinesDebug reliability incidents affecting growth surfaces, own the investigation end-to-end, and make sure the same failure mode doesn't repeatReview growth team pull requests for infrastructure soundness, scalability concerns, and anything that could cause problems at higher traffic volumesInstrument data pipelines to surface bottlenecks and failure points before they hit productionCoordinate with growth engineering to make clear calls about when to harden existing systems versus when to ship new onesSet the standards and patterns that the growth team builds against, so individual engineers aren't making the same infrastructure decisions from scratch on every projectIdentify the ambiguous systems that sit between teams, define their boundaries, and drive improvements without waiting for someone to assign them to youWhat We're Looking For7+ years of infrastructure or platform engineering experience, with meaningful time spent owning systems in productionTrack record of shipping systems under real user-growth pressure, not just maintaining inherited infrastructureComfortable owning systems end-to-end without close oversight, including making judgment calls when there's no obvious right answerExperience reducing incidents proactively, finding bottlenecks in data pipelines or user-facing flows before they become outagesStrong instincts for the tradeoff between shipping velocity and correctness in a fast-moving team environment(Plus) Prior experience building growth-specific infrastructure such as referral systems, onboarding flows, or user acquisition tooling(Plus) Experience working in small, high-autonomy engineering teams where the scope of your role is defined by what needs to get doneBenefitsCompetitive salary & equityUnlimited PTOFull Health, Vision, & Dental coverage401k matchHardware setup: new MacBook Pro, big display, & accessoriesPay TransparencyBase 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.LocationNew YorkEmployment TypeFull timeLocation TypeOn-siteDepartmentEngineering