Founding Engineer at Well-funded AI fintech startup

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.
She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Founding Engineer

Company Description: Well-funded AI fintech startup

Job Description:
You will lead the development of critical infrastructure enabling AI agents to execute secure financial transactions. As a founding engineer, you will own the technical architecture, integrate payment providers, and build sophisticated guardrails. This role offers the unique opportunity to shape a platform from its earliest stages while solving complex problems at the intersection of AI and fintech.

Location: London, UK

Why this role is remarkable:

• Join as a founding member with significant influence over the product's technical direction and company culture.

• Work at the cutting edge of AI agentic frameworks and financial infrastructure backed by top-tier VCs.

• High-autonomy environment where you own features end-to-end from initial architecture to final deployment.

What you will do:

• Architect and build the core building blocks and guardrails for AI-driven payment systems.

• Own end-to-end delivery of product features across the full stack, including APIs and infrastructure.

• Collaborate directly with founders to shape the technical vision and make foundational stack decisions.

The ideal candidate:

• Proven experience building products utilizing LLMs and agentic frameworks like LangGraph or OpenAI SDK.

• Strong full-stack proficiency in Python and TypeScript with experience in Next.js and Supabase.

• A product-minded builder who thrives in ambiguous environments and prioritizes craftsmanship alongside speed.

Who are Jack & Jill?
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.
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.

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 you're 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 isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't 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 we're giving his services away for free.