Web Platform Lead Engineer

About Polymarket

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.

About the Role

Polymarket's web team ships to production many times a day across our Next.js apps. This role owns the systems that make that velocity safe: the AI tooling, observability, alerting, and performance discipline that tell us — with evidence, automatically — that the site is fast and correct after every ship.

This is a hands-on architect role with a clear foundation to build on. The center of gravity is agentic tooling — building the AI-driven review, QA, verification, and release machinery the web team leans on daily. The rest is the observability, alerting, and performance foundation that machinery stands on.

What You'll Do

Build and maintain agentic workflows that give every web engineer leverage: PR review agents, automated verification of fixes against production data, perf-regression detection and bisection, release gates

Define the performance budget for Polymarket web and enforce it automatically — in CI, at the edge, and in RUM

Instrument what matters: real-user metrics tied to the surfaces where users trade, not vanity lab scores

Own the alert lifecycle end to end — from detector to dashboard to the engineer who acts on it; kill flaky signals and make green mean shippable

Set the architecture bar for how the web team measures, ships, and verifies — and automate it so the bar holds at high velocity

Own Core Web Vitals, real-user monitoring, bundle and rendering budgets, and caching and streaming strategy for Polymarket web

Maintain one coherent, trustworthy picture of production web health across errors, traces, and RUM

Own regression detection that fires when something real breaks — performance or correctness — and stays quiet otherwise

Build and maintain the views the team and leadership actually use: release health, vitals, error budgets, funnel-critical surfaces

Lead a small team from day one — set the direction, raise the bar, and multiply their output while staying hands-on

What We're Looking For

Expert in web performance — you can take a slow page and make it fast, and prove the win with real-user data, not lab runs

Experience shipping for real users at scale — you've owned a production web app with a large, active user base where a regression hit thousands of users within minutes and monitoring was how you knew

Deep Next.js experience: App Router, React Server Components, streaming/PPR, caching layers, hydration cost

Experience building AI/agentic developer tooling — or serious automation — that a team relied on daily, with opinions about where agents genuinely help vs. where they add noise

Experience owning observability and alerting for a high-traffic production product: instrumentation, dashboards, on-call signal quality

Strong systems thinking across the full path: CDN/edge caching, browser internals, measurement bias, backend latency's effect on the frontend

Bias for ownership — this domain has no backstop

Able to lead a small team while staying hands-on

(Plus) Real-money or trading product experience — where latency and correctness both cost money

(Plus) Cloudflare at depth: Workers, cache rules, edge telemetry

(Plus) Experience running LLM-based code review or test generation at scale

Benefits

Competitive salary & equity

Unlimited PTO

Full Health, Vision, & Dental coverage

401k match

Hardware setup: new MacBook Pro, big display, & accessories

Pay Transparency

Base salary range: $250,000 to $500,000 annually, plus equity and benefits.

This range reflects a good-faith estimate for this position. Experience levels vary widely within a title here, so please reach out even if your expectations fall outside it. We're always happy to chat.