Senior Backend Engineer, ISV (Product Infrastructure)

Polymarket•New York, NY

About The Position

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.

Requirements

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.

Nice To Haves

Experience at a high-growth consumer product company or marketplace.
Experience deploying systems in cloud environments (AWS/GCP) and using containers.

Responsibilities

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.
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.