Senior Backend Engineer, Product Infrastructure

Polymarket Backend/Product Engineer

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., Web Socket-to-gRPC-stream migrations) alongside event and notification infrastructure.

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

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

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

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

• 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., Web Socket-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.

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

• Competitive salary & equity

• Unlimited PTO

• Full Health, Vision, & Dental coverage

• 401k match

• Hardware setup — new Mac Book Pro, big display, & accessories