early-career backend engineer

The Markets Engineering team owns the infrastructure that keeps thousands of live markets accurate, up-to-date, and resolving correctly in real time - automation pipelines, external data integrations, and lifecycle systems that run continuously across a catalog spanning politics, sports, economics, and breaking news. When this layer works well, traders trust the platform. When it doesn’t, markets go stale, resolution breaks, and confidence erodes fast., * Build and maintain automation pipelines that handle market creation, parameter configuration, and lifecycle updates across thousands of concurrent markets

• Integrate sports APIs, news feeds, and other external data sources that drive market creation and resolution, including handling the messy, inconsistent data that comes with real vendors
• Design pipelines for reliability, idempotency, safe re-runs, and fast failure detection through monitoring and alerting
• Contribute to the data-driven systems that resolve markets accurately and on time
• Debug production failures across markets infrastructure, often under time pressure, with senior support available
• Review code and participate in design discussions as a full member of the engineering team

• 1-4 years of professional backend engineering experience, or equivalent evidence such as strong internships combined with serious personal projects
• Proficiency in TypeScript, Python, or Go - genuinely strong in at least one and able to move in the others
• Hands-on experience integrating third-party APIs and working with real-world data that is inconsistent, delayed, or poorly documented
• Evidence that you ship: a production job, public repositories with real code, or personal projects that are actually running
• Comfort with AI-native development tools such as Claude Code, Codex, or Cursor - this is part of how we work, not optional
• Ownership mindset - you want to run what you build and you care when things break
• Comfort on Linux and with cloud tooling, or a clear track record of picking up new infrastructure quickly
• (Plus) Personal projects built on Polymarket, Kalshi, or other prediction market APIs
• (Plus) Exposure to queues, streaming systems (Kafka, RabbitMQ), or workflow engines
• (Plus) Genuine interest in prediction markets, sports, or trading

• Competitive salary & equity
• Unlimited PTO
• Full Health, Vision, & Dental coverage
• 401k match
• Hardware setup: new MacBook Pro, big display, & accessories

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 terms of volume ($21B traded in 2025) and adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media and we need your help adding fuel to the fire.