Staff Fullstack Engineer

Polymarket; New York (NY); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Competitive salary & equity

Unlimited PTO

Health, Vision, & Dental

401k match

Hardware setup

Job summary

Polymarket is building a dedicated growth engineering function focused on turning curious visitors into active traders. You will own the new user onboarding flow, KYC completion, and ad-driven funnels, working across full stack with product and data teams.

This role requires a proven track record shipping onboarding flows and growth features that move the metrics in a measurable way. You will collaborate with multiple engineering squads, drive architectural decisions, and raise the technical bar

Qualifications

• 7+ years of fullstack engineering experience, with depth on frontend and backend.
• Experience delivering onboarding and KYC integrations with measurable impact.
• Ability to drive work across teams without strict top-down coordination.
• Strong instincts to spot funnel issues and propose fixes without waiting for specs.

Responsibilities

• Own the end-to-end onboarding flow from sign-up to KYC completion.
• Build ad-driven funnel surfaces that route users to market pages.
• Ship fullstack features across frontend, backend, and integrations.
• Identify friction points in the acquisition funnel using analytics and experiments.
• Review code and make architectural decisions within your domain.
• Coordinate across teams to implement changes and align stakeholders.
• Raise the technical bar on growth through code reviews and mentorship.

Skills

Fullstack engineering

Frontend development

Backend development

Onboarding flows

KYC integrations

Acquisition funnel

Product instincts

Growth experimentation

Education

Bachelor’s degree in CS or related field

Tools

React

Node.js

REST APIs

SQL/NoSQL

A/B testing frameworks

Job description

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

We re building a dedicated growth engineering function at the org level, and this role sits at the center of it. Your mandate is user growth: owning the new user experience from first touch to first trade, reducing friction in the acquisition funnel, and building the surfaces that turn curious visitors into active traders. This is not a siloed frontend or backend job - you will work across the entire stack and cut into whatever territory needs cutting into.The team operates with a mission-driven structure. You will collaborate closely with product, data, and other engineering teams, but you are expected to drive, not wait. Growth at Polymarket is not a marketing problem - it is an engineering problem. The onboarding flow, the KYC experience, the ad-driven funnels that bring people from a sports broadcast into a live prediction market: all of it gets built here.

What You ll Do

• Own and iterate on the new user onboarding flow, from account creation through KYC completion, with a focus on activation rates and drop-off reduction
• Build ad-driven funnel surfaces that route users from external campaigns directly into relevant market pages, coordinating with product on targeting logic and layout
• Ship fullstack features end to end - writing frontend UI, backend services, and third-party integrations - without needing work parceled out across teams
• Identify friction points in the user acquisition funnel using product analytics and experiment your way to solutions, measuring impact at each step
• Review code and make architectural decisions within your domain without waiting for senior sign-off or a fully specced ticket
• Coordinate across engineering teams to get changes made in services you do not own, aligning stakeholders and keeping things moving
• Raise the technical bar on the growth team through code review, direct feedback, and helping less senior engineers scope and ship better work

What We re Looking For

• 7+ years of fullstack engineering experience, with real depth on both the frontend and backend - not just familiarity with one side
• Proven track record shipping user onboarding flows, KYC integrations, or acquisition funnel features, with measurable results you can speak to
• Experience working across teams in a larger engineering org, navigating ownership boundaries and getting things done without top-down coordination
• Strong product instincts - you can look at a funnel, identify what is broken, and propose a fix without waiting for a product manager to hand you a spec
• Comfortable making technical tradeoffs at the system level, scoping across frontend, backend, and external services and choosing the right approach for the constraint
• Clear communicator who can align engineers, product managers, and stakeholders on scope and priorities without creating unnecessary process(Plus)
• Experience with Web3 onboarding flows or crypto-native KYC and compliance tooling(Plus)
• Familiarity with prediction markets, financial platforms, or other high-stakes transaction products(Plus)
• Experience running growth experiments with A/B testing frameworks and interpreting results to drive next steps

Benefits

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