About the role

Senior Full Stack Engineer role focused on payments
Processing large-value transactions through Stripe
Building a custom double-entry ledger system
70% backend work with React on the frontend
Collaborating in a small team of engineers

Skills the posting asks for

Ruby on Rails
React
Python
Postgres
Stripe

Summarised from the employer’s posting, which is reproduced in full below.

The employer’s full posting

Title: Full stack Engineer, Payments

Full-time

Remote- USA

About the Role

We are looking for a Senior Full stack Engineer with 3-5+ years of experience to build the financial engine powering Alt's double-sided marketplace for trading cards. You'll own real-time payments infrastructure processing large ACH transactions across a platform that grew 505% last year — this is not credit card processing, this is moving serious money.

Responsibilities

Processing thousands of large-value transactions ($100K+) through Stripe and banking partner integrations
Building and maintaining a custom double-entry ledger system for the marketplace
Developing new ledgers for future lending and financial products
Working 70% backend (Python) with React/React Native on the frontend
Collaborating on a small payments pod (3 engineers total) operating on a ticketing basis

Tech stack:

Rails
Python
Postgres
AWS
React
TypeScript
React Native
Stripe

Qualifications

Seniority: 4+ years of experience in full stack engineering processing large financial transactions (ACH, real- time payments)

Required Skills

Work experience: Experience with real- time payments or large- value ACH processing ($100K+ transactions)
Hard skills: AI- native development workflow — actively using AI coding tools (e. g. Claude) to accelerate output
Baseline: explanation is required if there is any gap in employment
Work experience: Backend- heavy full stack engineering (70%+ backend)
Hard skills: Rails
React frontend; React Native or mobile experience a plus