Senior Backend Engineer, ISV (Product Infrastructure) at Polymarket answer
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Job Description
<h1>About Polymarket</h1><p style="min-height:1.5em">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.</p><p style="min-height:1.5em">We’re growing fast: both in volume ($21B traded in 2025) and in adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media, powered by fast, reliable, and deeply technical market infrastructure.</p><p style="min-height:1.5em"></p><h1>About the role</h1><p style="min-height:1.5em">Polymarket is looking for a backend/product engineer to own the core domain APIs and data models that power our consumer-facing product.</p><p style="min-height:1.5em">You’ll work at the intersection of backend infrastructure and product, shipping the primitives that frontend, mobile, and product teams build on top of — with high ownership and a strong bias toward execution.</p><p style="min-height:1.5em"></p><h1>What you’ll do</h1><ul style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Design core domain APIs: </strong>Build and evolve the APIs and data models that underpin Polymarket’s consumer product at scale.</p></li><li><p style="min-height:1.5em"><strong>Build real-time infrastructure: </strong>Develop gRPC/Connect services and real-time streaming systems (e.g., WebSocket-to-gRPC-stream migrations) alongside event and notification infrastructure.</p></li><li><p style="min-height:1.5em"><strong>Ship end-user features: </strong>Partner directly with frontend, mobile, and product teams to deliver features like personalization, search, and live data feeds.</p></li><li><p style="min-height:1.5em"><strong>Unify fragmented systems: </strong>Consolidate fragmented services and APIs into cleaner, reusable primitives that speed up future feature development.</p></li><li><p style="min-height:1.5em"><strong>Balance debt and delivery: </strong>Pragmatically balance technical-debt cleanup with shipping new product surface area under tight deadlines.</p></li><li><p style="min-height:1.5em"><strong>Collaborate cross-functionally: </strong>Work closely with engineers across product, infra, and data to ensure tight integration with the broader platform.</p></li></ul><p style="min-height:1.5em"></p><h1>What we’re looking for</h1><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Backend/product engineering experience designing and evolving domain APIs and data models for a consumer-facing product at scale.</p></li><li><p style="min-height:1.5em">Hands-on experience with gRPC/Connect and real-time streaming (e.g., WebSocket-to-gRPC-stream migrations) and event/notification infrastructure.</p></li><li><p style="min-height