Senior Payment Processor Integration Engineer

About Revley

Revley is a bootstrapped fintech startup headquartered in Manhattan, already profitable on unit economics. We're building the operating system for high-scale commerce — a platform that gives subscription brands ownership of their payment infrastructure, lets them process across any gateway, and unifies checkout, subscriptions, and chargeback prevention into one system.

Our largest merchant processes $20M/month. In 8 months we've signed B2B contracts with 12 enterprise partners including Stripe, Adyen, Airwallex, Nuvei, NMI, Finix, Braintree, and Authorize.net.

The Role

This is a 1099 independent contractor position. You ship from day one. Your code goes live to merchants doing $50K–$5M+ MRR. You move fast, break nothing, and own what you build.

What You'll Do

Build and maintain payment processor integrations using a strategy-pattern architecture (Stripe, Adyen, NMI, Airwallex, Braintree, Authorize.net). Develop checkout flows including credit card, Apple Pay, Google Pay, and PayPal with client-side tokenization. Build subscription billing logic covering initial and merchant-initiated transaction flows, auth holds, captures, refunds, and voids. Design webhook consumers that normalize async events from multiple processors into a unified internal event model. Write clean, tested TypeScript across NestJS backend and Next.js frontend. Build Shopify integrations using the Admin API (GraphQL), Storefront API, script tag injection, and selling plan management. Optimize checkout latency with a target of sub-5-second checkout. Implement and maintain GitHub Actions CI/CD and end-to-end testing on staging branches.

Must-Haves

Strong proficiency in Next.js, NestJS, and TypeScript. SQL and PostgreSQL experience (Supabase is a plus). Git and GitHub fluency including PRs, branching, and code review. Experience with REST APIs and webhook-driven architectures.

MUST HAVE — Payment / E-Commerce Background

Experience integrating payment processors such as Stripe, Adyen, Shopify Payments, PayPal, Braintree, NMI, or similar. Familiarity with tokenization, PCI compliance, auth/capture flows, and network tokens. Experience building checkout flows for e-commerce platforms (Shopify, BigCommerce, WooCommerce, or custom). Shopify API experience including Admin, Storefront, webhooks, and app development. Subscription billing or recurring payments experience.

Our Stack

Next.js, NestJS/TypeScript, Supabase (PostgreSQL), Vercel, GitHub Actions, Stripe Connect (OAuth), Adyen, Airwallex, NMI, Shopify Admin API (GraphQL), Linear

Compensation

$80K–$110K USD annually. Semi-annual performance reviews with compensation adjustments. Open to candidates in the USA or Canada. Visa sponsorship available for candidates who transition to full-time employment.

• We care about what you've built, not how many years it took you.