Senior Backend Engineer - Payments Platform

The Role:
You are full stack but you live on the backend. You care deeply about what happens when a payment fails, an API returns an unexpected response, or a queue backs up at 2am. You will own the backend services, payment workflows, and event-driven systems that sit at the core of our platform — and you will touch the frontend when the team needs it.
This is a high-intensity role at an early-stage company. This role will ask more of you than a typical engineering job — systems need to stay up, deadlines are real, and the team is small.
Responsibilities:

Production Node.js backend services and REST APIs — versioned, contract-stable, and hardened
ACH payment workflows end-to-end — debits, credits, retries, failure handling, virtual account ledgering, and reconciliation
Event-driven services using AWS SQS and webhooks for reliable asynchronous processing
PostgreSQL schemas that support complex financial workflows with integrity under failure
CI/CD co...