Senior Backend Engineer, Product Infrastructure

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 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.

About the role
Polymarket is looking for a backend/product engineer to own the core domain APIs and data models that power our consumer-facing product.

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.

What you’ll do

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Design core domain APIs: Build and evolve the APIs and data models that underpin Polymarket’s consumer product at scale.


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Build real-time infrastructure: Develop gRPC/Connect services and real-time streaming systems (e.g., WebSocket-to-gRPC-stream migrations) alongside event and notification infrastructure.


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Ship end-user features: Partner directly with frontend, mobile, and product teams to deliver features like personalization, search, and live data feeds.


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Unify fragmented systems: Consolidate fragmented services and APIs into cleaner, reusable primitives that speed up future feature development.


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Balance debt and delivery: Pragmatically balance technical-debt cleanup with shipping new product surface area under tight deadlines.


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Collaborate cross-functionally: Work closely with engineers across product, infra, and data to ensure tight integration with the broader platform.



What we’re looking for

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Backend/product engineering experience designing and evolving domain APIs and data models for a consumer-facing product at scale.


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Hands-on experience with gRPC/Connect and real-time streaming (e.g., WebSocket-to-gRPC-stream migrations) and event/notification infrastructure.


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Track record partnering directly with frontend, mobile, and product teams to ship end-user features.


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Experience unifying fragmented services and APIs into cleaner, reusable primitives.


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Pragmatic judgment for balancing technical-debt cleanup with shipping new product surface area under P0 deadlines.


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(Plus) Experience at a high-growth consumer product company or marketplace.


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(Plus) Experience deploying systems in cloud environments (AWS/GCP) and using containers.



Benefits

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Competitive salary & equity


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Unlimited PTO


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Full Health, Vision, & Dental coverage


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401k match


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Hardware setup — new MacBook Pro, big display, & accessories



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

This is a good-faith range for the level we're hiring at. Experience varies widely within a title here, so if your expectations fall outside it, reach out anyway. We're always happy to talk it through.



Skills:

Amazon Web Services (AWS), Application Programming Interface (API), Cloud Computing, Cross-Functional, Customer Relations, Data Modeling, Economics, Engineering, GCP (Good Clinical Practices), Mobile Devices, Politics, Product Design, Product Engineering, Product Shipments, Sports, Time Management, User Interface/Experience (UI/UX)



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Polymarket