Senior Product Engineer - Agentic AI

JR United Kingdom; City Of London; On-site; GBP 60,000 - 90,000; Full time

Job summary

A pioneering company in the B2B payments sector is seeking a Senior Product Engineer to join their innovative team in London. This role involves developing cutting-edge AI technologies aimed at transforming manual payment processes into efficient solutions. As part of a small team backed by top-tier investors, you'll have the opportunity to influence product direction and work across the technology stack, contributing to a dynamic company culture focused on delivering outstanding user experiences.

Qualifications

• Deeply curious and passionate about building products users love.
• Experience working across the stack - UX, API design, AI architectures.
• Desire to shape tech choices and company culture.

Responsibilities

• Build an AI partner that manages business receivables.
• Collaborate in a small team to innovate payment processes.
• Shape product decisions and contribute to company culture.

Skills

Product Development

AI Architectures

UX Design

API Design

Tools

TypeScript

Next.js

Vercel

Supabase/Postgres

Tailwind

Job description

Social network you want to login/join with:

Senior Product Engineer - Agentic AI, London (City of London)

Client:

Location:

London (City of London), United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

Job Views:

3

Posted:

26.06.2025

Expiry Date:

10.08.2025

Job Description:

Payments might seem slick for consumers, but businesses still trade with each other manually. Every year, millions of people work to exchange documents, emails and phone calls, and send checks and bank transfers worth tens of trillions of dollars.

Lunos is transforming this sleepy world of B2B payments, starting with an AI partner that ensures businesses get paid by managing their receivables just like a human would—well, how they would if they worked on it 24/7, never forgot anything, and read every message ever sent to them.

We’re a small team with big ambitions, backed by top-tier VCs who were early backers of companies like Stripe and Airbnb. We’re building in a modern stack (TypeScript, Next.js, Vercel, Supabase/Postgres, Tailwind), blending powerful agentic AI architectures, curated LLM pipelines, quantitative methods, and robust SaaS foundations.

We’re looking for Founding Engineers who:

• Are deeply curious and passionate about building products users truly love
• Get frustrated when things don’t move fast enough
• Want their voice to shape product decisions, tech choices, and company culture
• Enjoy the freedom and challenge of working across the stack, from intuitive UX and robust API design to AI architectures and prompt engineering
• Believe AI is fundamentally reshaping the world—and want to be part of it

Sound like your kind of adventure? Let’s talk. ?