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PolymarketPolymarketNew York, NY

Senior Backend Engineer, Payments

Senior backend engineer building and scaling Polymarket's payments infrastructure for deposits, withdrawals, and financial operations. Requires senior payments/fintech experience, leadership of zero-downtime migrations to distributed Go/gRPC services, and cross-functional work on regulated features like KYC and fraud.

Salary not listed
On-site5+ YOEBackend Engineering

About the role

Responsibilities

  • 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.

Requirements

  • 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).

Nice-to-Haves

  • Experience in crypto, prediction markets, or other high-growth regulated fintech environments.
  • Experience deploying systems in cloud environments (AWS/GCP) and using containers.

Compensation and Benefits

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

Skills

GogRPCDynamoDBMySQLStripeAWSGCPkycFintech

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