Founding Engineer (£90k-£110k + Equity) at AI-native fintech infrastructure at Jack & Jill/External ATS

London, England, United Kingdom -

Full Time

Start Date

Immediate

Expiry Date

01 May, 26

Salary

110000.0

Posted On

31 Jan, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Full-Stack Development, Backend Development, AI-Enabled Products, API Design, Multi-Tenant Systems, Financial Workflows, Architecture, Technical Strategy, Product Development, LLMs, Systems Thinking, High Autonomy, Zero-To-One Products, Early-Stage Systems, Frontend Integration, Agentic Workflows

Industry

Staffing and Recruiting

Description

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 (AI × Fintech) Salary: £90k-£110k + Equity Company Description: AI-native fintech infrastructure startup Job Description: As the Founding Engineer, you will build the core agentic financial operations platform from the ground up. You will design API-first, multi-tenant systems that allow partner platforms to embed white-label AI agents for automated financial workflows. This is a high-ownership role working directly with founders to set the engineering foundations and product direction. Location: London, UK Why this role is remarkable: True founding-level ownership with meaningful equity in a high-growth AI-native fintech. Backed by senior industry advisors from global payment giants and top-tier fintech companies. Massive surface area to build production-grade AI agent systems rather than simple experiments. What you will do: Build the core platform end-to-end, including backend APIs and frontend integration components. Design and implement multi-tenant agentic workflows using LLMs as core infrastructure. Partner directly with founders on architecture, product trade-offs, and technical strategy. The ideal candidate: Senior full-stack or backend-leaning engineer with hands-on experience shipping AI-enabled products. Proven track record of building zero-to-one products or early-stage systems in production. Pragmatic systems thinker who thrives in high-autonomy environments without heavy process. 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.

Responsibilities

As the Founding Engineer, you will build the core agentic financial operations platform from the ground up, including backend APIs and frontend integration components. You will partner directly with founders on architecture, product trade-offs, and technical strategy.