Lead Performance Web Engineer

What You'll Do

• Own web performance end-to-end. Take responsibility for load times, rendering performance, and runtime efficiency across Polymarket's web platform, with measurable targets and a clear plan to hit them.
• Set the technical direction. Define the architecture, standards, and tooling that govern how Polymarket approaches performance – caching strategy, rendering pipeline, bundle discipline, and edge delivery.
• Optimize the critical rendering path. Identify and eliminate bottlenecks in how pages load and render, including server-side rendering, hydration, code splitting, lazy loading, and asset delivery.
• Drive caching and CDN strategy. Design and maintain caching architectures at every layer (browser, CDN, and edge) to minimize latency and maximize cache hit rates at scale.
• Build performance observability. Instrument real user monitoring, Core Web Vitals tracking, and synthetic testing so the team has continuous, actionable visibility into performance regressions.
• Set the performance bar across engineering. Establish benchmarks, budgets, and standards that keep performance a first-class concern as the product and engineering team grow.

What We're Looking For

• Deep experience in web performance engineering at significant scale – you've worked on systems serving billions of page loads and know what breaks at that level
• Strong expertise across the web performance stack: rendering, caching, CDN configuration, bundle optimization, and Core Web Vitals
• Proficiency in JavaScript and TypeScript, with a strong understanding of how browser engines, the V8 runtime, and the network layer interact
• Experience with real user monitoring, synthetic performance testing, and building observability systems that surface regressions before users feel them
• A rigorous, measurement-driven approach: you don't guess at performance problems, you profile, instrument, and prove them
• Technical leadership experience: you've set direction, raised the bar across a codebase, and influenced how a broader engineering team thinks about performance
• (Plus) Experience with Next.js, React, and modern SSR/SSG rendering strategies at scale
• (Plus) Familiarity with edge computing, worker runtimes, or CDN-level programmability

Benefits

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