Senior Backend Engineer, Product Infrastructure

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

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

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

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

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

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

Competitive salary & equity

Unlimited PTO

Full Health, Vision, & Dental coverage

401k match

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

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.

Design core domain APIs:

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

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.

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.