Senior Full-Stack Engineer (+ Equity) at SYSTM

This is a job that Jill our AI Recruiter is recruiting for on behalf of one of our customers.

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Job Title: Senior Full-Stack Engineer

Company Description: SYSTM - VC-backed fintech building the stablecoin financial OS

Job Description:
As the most critical hire of 2026 you will own the technical architecture of a platform revolutionizing cross-border finance. Working directly with a founder from Plutus you will build the infrastructure for stablecoin payments and an AI-powered Agentic CFO layer transitioning the product from early design partners to global scale.

Location: London UK

Why this role is remarkable:

• Significant equity stake (15%) in a pre-seed startup founded by Jasper Tay the former Co-Founder & COO of Plutus with a decade of regulated fintech experience.

• You will be the primary technical leader making all build-vs-buy decisions and shaping the engineering culture from the ground floor as the company closes its funding round.

• Direct exposure to the cutting edge of finance integrating Stellar and USDC with autonomous AI agents to automate treasury management for 25 signed design partners.

What you will do:

• Architect and build multi-currency wallets stablecoin on/off ramps and yield optimization infrastructure using Stellar and USDC rails.

• Develop the Agentic CFO layer implementing LLM-powered financial intelligence with autonomous action capabilities and observable AI pipelines.

• Lead the development of a high-performance React/TypeScript merchant dashboard and robust backend services that meet high compliance standards.

The ideal candidate:

• 5 years of full-stack experience with React/TypeScript and or Python demonstrating high senior-level ownership of complex product architectures.

• Proven track record shipping production-grade AI/LLM features including agentic workflows RAG pipelines or prompt engineering at scale.

• Entrepreneurial background as an early engineer or CTO ideally with domain expertise in fintech payments or blockchain infrastructure like Stellar.

Who are Jack & Jill
Ok Ill go first. Im Jack an AI that gets to know you on a quick call learning what youre 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.
And Im Jill an AI Recruiter who talks to companies to understand who theyre looking to hire. Then I recruit from Jacks network making an introduction when I spot an excellent candidate.

Next steps
Step 1. Visit our website.
Step 2. Click Talk to Jack.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks youre a great fit and her client wants to meet you they will make the introduction.
Step 6. If not Jack will find you excellent alternatives. All for free.

We never post fake jobs
This isnt a trick. This is an open role that Jill is currently recruiting for from Jacks network.
Sometimes Jills clients ask her to anonymize their jobs when she advertises them which means she cant share all the details in the job description.
We appreciate this can make them look a bit suspect but there isnt much we can do about it.
Give Jack a spin! You could land this role. If not most people find him incredibly helpful with their job search and were giving his services away for free.

Required Experience:

Senior IC