Senior Full-Stack Engineer at Pre-seed fintech building stablecoin infrastructure

Are you ready to build the financial operating system for the stablecoin era? We are looking for a Senior Full-Stack Engineer to serve as a founding technical leader, owning the architecture of a platform that combines Stellar/USDC rails with an AI-powered Agentic CFO. Founded by the former COO of a major European crypto payments company and backed by strategic VCs, this startup already has 25+ design partners signed. If you have 5+ years of experience and a track record of shipping AI-powered systems at the ground floor, this is your chance to claim 1–5% equity and define the future of programmable finance.

Overview

Role overview

Join a high-growth fintech as the founding technical leader building the future of cross-border commerce. You will own the technical architecture for a platform integrating Stellar/USDC rails with an AI-powered Agentic CFO layer. This is a high-ownership role driving product execution from early design partners to global scale.

Company

SYSTM

Pre-seed fintech building the financial operating system for the stablecoin era

Responsibilities

What you will do

Architect and build core treasury infrastructure including multi-currency wallets, stablecoin on/off ramps, and yield optimization protocols.
Develop the Agentic CFO layer featuring LLM-powered financial intelligence, autonomous action pipelines, and semantic caching.
Lead the end-to-end execution of a merchant dashboard using React/TypeScript and Node.js/Python to simplify complex global financial operations.

Candidate profile

Who this is a fit for

5+ years of full-stack experience with production ownership of React/TypeScript and Node.js or Python backend systems.
Proven track record shipping AI/LLM-powered products including agentic workflows, RAG pipelines, or LLM infrastructure.
Previous experience as an early engineer or CTO at a startup with a strong bias for shipping in fast-paced, high-ownership environments.

What makes it remarkable

Why this role is remarkable

Significant founding-level equity (1–5%) and the chance to shape the engineering culture from the ground up as the most important hire of 2026.
Lead a product with 25+ signed design partners, founded by an industry veteran who previously scaled a major European crypto card issuer.
Build at the cutting edge of finance, combining programmable stablecoin infrastructure with autonomous AI agents to automate treasury and cross-border payments.

Jack & Jill

How Jack & Jill work together

I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Meet Jack

Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.

How does this work?

Jack's an AI agent for job searching and career coaching. He works for you.

Jill is the AI recruiter working for the company. She recruits from Jack's network.

If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.

Find a job with

Jack