Polymarket is hiring a Senior Backend Engineer, Product Infrastructure in Engineering — New York. The overview below is synthesized from the employer posting on jobs.ashbyhq.com: factual requirements and scope are preserved, but prose is rewritten with editorial context. Verify details and apply via the employer link.
About Polymarket
Company context from the listing:
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.
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
Day-to-day scope for the Senior Backend Engineer, Product Infrastructure as described in the posting:
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
Day-to-day scope for the Senior Backend Engineer, Product Infrastructure as described in the posting:
- 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
What the posting highlights about the offer:
- Competitive salary & equity
- Unlimited PTO
- Full Health, Vision, & Dental coverage
- 401k match
- Hardware setup — new MacBook Pro, big display, & accessories
Build a standout application
For the Senior Backend Engineer, Product Infrastructure at Polymarket, reviewers look for concise evidence over buzzwords. Mirror the language of the posting sparingly, quantify support or delivery outcomes, and show how you handled ambiguity, time-zone collaboration and user empathy. Keep your resume to impact, keep your cover note to one page, and link to artifacts — tickets resolved, docs shipped, dashboards owned — that prove you can operate in a fast-moving Web3 team. Prepare to discuss a time you turned a confusing user report into a clear fix and how you measure quality in support and operations.
Web3 hiring values reliability: on-time follow-through, clear writing, and a track record of improving runbooks and tooling. Treat the application as a work sample. For interviews, be ready to walk through how you prioritize across time zones, handle a difficult user, and decide when to escalate versus resolve directly. Show how you document decisions so the next teammate benefits.
In a distributed Web3 org, trust builds through written clarity. Use the cover note to demonstrate it.