Founding Engineer

Job description

The Opportunity A pre-seed, founder-led startup is seeking a Founding Engineer to build the "Agentic Financial Ops" layer for the global fintech market. While others build simple chatbots, this stealth-mode venture is embedding autonomous AI agents directly into major B2B platforms—automating invoicing, bill pay, and payroll for SMBs. This is an opportunity to join at the ground floor of a company targeting a $100B market shift.

What you will build:

• The Engine: A white-label, API-first, multi-tenant system designed to embed cleanly and securely into partner ecosystems.
• The Intelligence: You aren’t just calling APIs; you are treating LLMs as infrastructure. You will build agentic workflows that handle complex financial operations autonomously.
• The Foundation: You will replace the founder’s initial "vibe-coded" prototype with a robust, production-ready architecture. You decide the stack; you set the engineering culture.

The Founders:

• The Commercial Engine: A domain experts and "straight talkers" (formerly VPsat a successful embedded finance scale-up). They have already secured signed contracts across the UK, US, and Europe—and early revenue—before the API is even live. They bring the pipeline, the deep market knowledge, and the capital; you bring the product.

The Role This is not a ticket-taking role at a stagnant SaaS. This is a Decide + Build + Own seat where you sit directly beside the founder.

• Zero to One: Take the product from MVP concept to Production.
• Full Ownership: Build the core platform end-to-end (Backend, APIs, Frontend).
• Architecture: Design for security, permissions, and scale from day one.
• Speed: Iterate fast with real customers. The goal is to launch the API in Q2.

The Profile

• Mindset: Scrappy, high-growth, and product-minded. You care deeply about why a feature exists, not just how it’s built.
• Experience: A Senior Engineer (Backend-leaning or Full-stack) who has shipped early-stage products into production.
• Tech: Hands-on experience with LLMs & agentic workflows. You are pragmatic about tech choices that optimize for speed and correctness.

The Offer Salary £95k–£120k + Significant Founding Equity.

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

04-02-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English