Senior Product Engineer - Agentic AI

JR United Kingdom; London; On-site; GBP 65,000 - 95,000; Full time

Job summary

A leading startup in B2B payments is seeking a Senior Product Engineer to revolutionize transactions with cutting-edge AI solutions. Join a dynamic team with a vision to reshape the finance landscape, involving product development from UX to complex AI architectures.

Qualifications

• Deep curiosity and passion for building user-centric products.
• Desire to shape product decisions and company culture.
• Comfortable in a fast-moving environment and across tech stacks.

Responsibilities

• Engaging with product decisions, tech choices, and company culture.
• Working across UX, API design, AI architectures, and product development.

Job description

Senior Product Engineer - Agentic AI, London

Client: N/A

Location: London, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Views:

3

Posted:

24.06.2025

Expiry Date:

08.08.2025

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, phone calls, 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—working 24/7, never forgetting anything, and reading every message sent.

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 with 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 UX and 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!