# Senior Backend Engineer, ISV

**Company:** [Polymarket](https://hotfix.jobs/companies/polymarket)
**Location:** New York, NY
**Role:** Backend Engineering
**Experience:** 5+ years
**Skills:** gRPC, connect, websocket, AWS, GCP, API Design, Data Modeling, real-time streaming, event infrastructure, notification infrastructure
**Posted:** 2026-07-24

> Senior backend engineer owning core domain APIs, data models, real-time streaming (gRPC, WebSockets), and event infrastructure that power Polymarket's consumer prediction market product. Partner closely with frontend, mobile, and product teams to ship features while unifying services and balancing tech debt.

## Job Description

## What you’ll do
- 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.

## What we’re looking for
- 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.
- (Plus) Experience deploying systems in cloud environments (AWS/GCP) and using containers.

## Benefits
- Competitive salary & equity
- Unlimited PTO
- Full Health, Vision, & Dental coverage
- 401k match
- Hardware setup — new MacBook Pro, big display, & accessories

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