Senior QA Engineer

About the role

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.

What You’ll Do

• Automated Test Infrastructure: Build automated test suites from scratch covering web, backend APIs, and critical trading flows. We recommend TypeScript and Playwright, but you'll have input on the stack.
• Release Quality: Define and own the release testing process. Work with the TPM to ensure releases are structured, tested, and still shipping fast.
• Product Coverage: Deeply understand the product so you can identify what to test. Trading flows, market creation, settlement, edge cases that could cost users money.
• CI/CD Integration: Integrate automated tests into the deployment pipeline so issues get caught before they hit production.
• Bug Tracking & Visibility: Use Linear to track issues, coordinate with engineering on fixes, and maintain visibility into quality metrics.
• Team Building: As we grow, hire and mentor 2-3 additional QA engineers to build out the function.

What We’re Looking For

• 3+ years in QA engineering or SDET roles, with time at startups scaling quickly
• Strong automated testing skills. You've built test infrastructure from scratch, not just maintained existing suites.
• Experience with modern frameworks (Playwright, Cypress, or similar)
• Trading or fintech product experience. You've tested products where real money is at stake and understand what can go wrong.
• Crypto/DeFi familiarity. Understanding of blockchain mechanics and how crypto products work. Strongly preferred
• Full-stack testing experience across web applications and backend APIs
• Comfortable with TypeScript or Python for test automation
• Experience with CI/CD integration (GitHub Actions, CircleCI, or similar)
• Strong communication skills. You can explain quality tradeoffs to engineers and push back when needed
• (Plus) Experience at prediction markets, sports betting platforms, or trading exchanges
• (Plus) Experience leading or mentoring a small QA team
• (Plus) Performance and load testing background
• (Plus) Mobile iOS testing experience
• (Plus) Security testing exposure

Benefits

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