Founding Engineer at Well-funded AI fintech startup

London - UK

Monthly Salary: Not Disclosed

Posted on: 2 days ago

Vacancies: 1 Vacancy

Job Summary

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

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:

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 Jacks network.The next step is to speak to Jack.Founding EngineerCompany Description: Well-funded AI fintech startupJob Description:You will lead the development of cri...