Senior Backend Engineer, Payments

Polymarket; New York (NY); On-site; USD 180,000 - 260,000; Full time

Benefits offered by this job

Competitive salary & equity

Unlimited PTO

Health, Vision, & Dental coverage

401k match

MacBook Pro setup

Job summary

Polymarket is seeking a senior backend engineer to design and scale the payments infrastructure that powers deposits, withdrawals, and money movement across the platform. You will work at the intersection of engineering and regulated financial operations with high ownership, partnering with Product, Compliance, and Design.

Responsibilities include building payments services, integrating with processors and banking rails, and delivering KYC/EDD, fraud checks, and reconciliation features while

Qualifications

• Senior backend engineer with payments/fintech experience.
• Track record migrating to distributed services with minimal disruption.
• Collaborates with Product, Compliance, and Design on regulated features.

Responsibilities

• Build payments infrastructure and migrate from legacy systems to distributed services.
• Integrate with payment processors, banking rails, and card networks.
• Deliver KYC/EDD, fraud checks, and reconciliation features.
• Own on-call production reliability for money-movement systems.
• Mentor engineers, onboard new hires, and reduce tech debt.
• Collaborate with platform engineers to keep payments integrated.

Skills

Payments backend

Go / gRPC

On-call ownership

Mentoring

Tools

AWS

Go

DynamoDB

MySQL

GCP

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 volume ($21B traded in 2025) and in adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media, powered by fast, reliable, and deeply technical market infrastructure.

About the role

Polymarket is looking for a senior backend engineer to build and scale the payments infrastructure that powers deposits, withdrawals, and money movement across the platform.

This role sits at the intersection of engineering and regulated financial operations, and requires the judgment to move fast without compromising correctness or auditability. You’ll be a high-ownership individual contributor working closely with Product, Compliance, and Design.

What you’ll do

• Build payments infrastructure: Design and lead migrations from legacy or monolithic systems to reliable, distributed payments services (Go, gRPC, DynamoDB/MySQL) with no disruption to production money movement.

• Integrate with financial rails: Build and maintain integrations with payment processors, banking rails, and card networks to support deposits, withdrawals, and settlement.

• Ship regulated features: Partner cross-functionally with Product, Compliance, and Design to deliver high-stakes financial features such as KYC/EDD, fraud checks, and reconciliation.

• Own correctness and auditability: Take ownership of production on-call for money-movement systems where correctness, reliability, and auditability are non-negotiable.

• Drive team process: Mentor engineers, onboard new hires, and lead backlog grooming and tech‑debt reduction efforts.

• Collaborate cross-functionally: Work closely with engineers across the platform to keep payments systems tightly integrated with the broader exchange.

What we’re looking for

• Senior-level backend engineering experience with payments, fintech, or financial-data integrations (processors like Stripe, banking rails, card networks).
• Proven track record leading migrations from legacy/monolith systems to reliable distributed services (Go, gRPC, DynamoDB/MySQL) without production disruption.
• Experience partnering with Product, Compliance, and Design to ship regulated or high‑stakes financial features (KYC/EDD, fraud, reconciliation).
• Comfortable owning production on‑call for money‑movement systems where correctness and auditability are critical.
• Track record of mentoring, onboarding, and driving team process (backlog grooming, tech‑debt reduction).
• (Plus) Experience in crypto, prediction markets, or other high‑growth regulated fintech environments.
• (Plus) Experience deploying systems in cloud environments (AWS/GCP) and using containers.

Benefits

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