Senior Full Stack Engineer – Payments Infrastructure

About the role

Revley is seeking a Senior Full Stack Engineer to help architect and scale its core payments platform. This independent‑contractor position works directly with the founders and a small senior engineering team to build systems that move real money for customers every day, with the possibility of converting to a full‑time role.

Key responsibilities

• Architect and ship multi‑PSP payment routing across nine or more processors using strategy‑pattern adapters in NestJS and TypeScript.
• Build and maintain network tokenization flows and processor‑agnostic token storage meeting PCI Level 1 requirements.
• Design and implement subscription billing logic, including checkout, rebilling, authorization holds, captures, refunds, and voids.
• Develop webhook consumers for asynchronous processor events across all PSPs.
• Make architectural decisions on database design, queueing, and observability, documenting them for the team.
• Create custom checkout experiences with Next.js (frontend) and NestJS (backend) supporting credit card, Apple Pay, Google Pay, and PayPal.
• Integrate with Shopify Admin and Storefront APIs for order creation, selling‑plan management, and merchant onboarding.
• Mentor engineers and contribute to engineering best practices.

Required profile

• Five or more years of professional software engineering experience with a track record of shipping production systems end‑to‑end.
• Strong backend engineering skills, especially with Node.js and TypeScript (NestJS or comparable framework).
• Demonstrated experience integrating payment processors and building payment‑related infrastructure.
• Ability to work autonomously, own features from specification through deployment, and make sound architectural decisions.

Required skills

• Node.js
• TypeScript
• NestJS
• Next.js
• PCI Level 1 compliance
• Webhook development
• Database design
• Queueing systems
• Observability tools
• Shopify API integration
• Apple Pay
• Google Pay
• PayPal