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Senior Fullstack Engineer (70% Backend) – Financial Payments Infrastructure

treqs United State
Remote Visa Sponsorship
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AI Summary

Join a fast-growing fintech marketplace as a Senior Fullstack Engineer to design and maintain real-time payments infrastructure, processing large ACH transactions via Stripe and banking integrations. You’ll build and scale a custom double-entry ledger system while collaborating in a small payments engineering team. Requires 4+ years of fullstack experience with financial transactions, strong Python backend skills, and proficiency in React/React Native.

Key Highlights
Own and develop real-time payments infrastructure handling thousands of high-value ACH transactions
Build and maintain a custom double-entry ledger system for financial products
70% backend (Python) focus with React/React Native for frontend development
Key Responsibilities
Process thousands of large-value transactions ($100K+) via Stripe and banking partner integrations
Design and maintain a custom double-entry ledger system for financial transactions
Develop new ledgers for upcoming lending and financial products
Collaborate in a small payments engineering team (3 engineers total)
Technical Skills Required
Python React PostgreSQL
Benefits & Perks
$180,000 base salary + competitive equity + pension + health insurance
100% remote work with US-based requirement
Visa sponsorship (OPT, H1B) available

Job Description


A fast-growing marketplace platform is building the financial engine behind its double-sided marketplace and they are hiring a Senior Fullstack Engineer (70% backend) to help own it.


You'll be working on real-time payments infrastructure moving large ACH transactions across a platform that grew 500+% last year, backed by leading industry investors.


What you'll be doing:

🔹 Processing thousands of large-value transactions ($100K+) via Stripe and banking partner integrations

🔹 Building and maintaining a custom double-entry ledger system

🔹 Developing new ledgers for upcoming lending and financial products

🔹 Working ~70% backend (Python) with React/React Native on the frontend

🔹 Collaborating in a tight-knit payments pod (3 engineers total)


What we're looking for:

✅ 4+ years fullstack experience with large financial transactions (ACH, real-time payments)

✅ AI-natice, especially with Claude

✅ Strong Python backend skills; comfortable across React/React Native

✅ Experience with Stripe, Postgres, AWS


Details:

💰 c.$180K base + competitive equity + pension +health

🌎 100% remote, must be US-based

✈️ Open to visa transfers (OPT, H1B)

🏢 ~50 employees | Well-funded, backed by top-tier investors


There's lot's more to discover!


📩 Interested or know someone who'd be a great fit? Apply here or reach out to me directly — [email protected]



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