---
title: 'Senior Product Engineer - Fullstack at Lunos'
canonical: 'https://feeny.ai/job/senior-product-engineer-fullstack-lunos-new-york-kfe5zcddb8cr'
type: 'job'
last_seen: '2026-09-12'
---

# Senior Product Engineer - Fullstack at Lunos

- **Company:** Lunos
- **Location:** New York, NY
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-04-14
- **Last confirmed live:** 2026-09-12
- **Apply:** https://jobs.gem.com/lunos-ai/am9icG9zdDpd37UJLmcnpX6byt63uijJ

## Job description

Payments might seem slick for consumers, but $100tn of Global B2B commerce still runs on the manual labor of millions of people in finance teams around the world. It’s been this way forever. Despite software, APIs and new payment methods. That’s because it’s not a payments problem. It’s a communication and negotiation problem. One that computers couldn’t solve. Until now.

Lunos is replacing this with a network of AI agents, starting with accounts receivable. We offer an AI partner that ensures businesses get paid by managing their receivables (what they are owed) 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 Senior Product 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. 🚀

## About Lunos

## Company Overview
- **One-liner**: Lunos builds an AI agent that automates accounts receivable, handling collections, follow-ups, and customer communication like a human teammate.
- **Entity Type**: Private (Pre-Seed; $5M raised)
- **Headquarters**: New York, New York, United States
- **Founded**: 2024
- **Founders**: Duncan Barrigan (CEO)

## Core Business
- **Primary industry**: Accounts Receivable Automation / Fintech
- **Target customers**: B2B finance teams – from AR specialists to CFOs, in SMBs and enterprises.
- **Mission statement**: “Tame the wilds of receivables” – making $100 trillion in B2B invoicing flow smoothly by replacing manual, human-to-human processes with AI agents.

## Products & Services
- **Lunos AI Accounts Receivable Agent**: A SaaS platform that connects to ERP/CRM systems (NetSuite, Xero, QuickBooks, Salesforce, HubSpot) and acts as an AI teammate. It sends personalized emails and calls, handles dispute management, follows up on promises to pay, manages OOO scenarios, and routes messages to decision-makers – all while learning each customer’s tone and intent.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private)
- **Key Metric**: Total Funding – $5M (Pre-Seed, raised 2025-10-30)
- **Notable Investors/Partners**: Cherry Ventures (lead), General Catalyst (participated)
- **Growth Signals**: Headcount grew 220% YoY (from ~3 to 14 employees); 10+ product updates per day; offices in New York, Boston, and London; LinkedIn followers grew 2.6% monthly to 2,190.

## Competitive Advantages
- **Human-like AI communication** – Unlike rigid, no-reply automation tools, Lunos reads emails, understands intent, and adapts its approach per customer, maintaining relationships while collecting payments.
- **Deep system integration** – Works across major ERPs and CRMs, giving a single live view without switching tabs.
- **Proactive & responsive** – Handles exceptions, disputes, and follow-ups 24/7, reducing DSO and write-offs without adding headcount.

## Strategic Focus
- Scaling the AI agent to handle thousands of accounts while keeping transparency and control for finance teams.
- Expanding product capabilities (dispute management, reconciliation, cash application, payment orchestration).
- Growing the team across engineering, sales, and growth to support rapid product iteration.

## Why Work Here
- **Culture**: Small, ambitious founding team (50+ years combined fintech experience) pushing each other to do their best work. High ownership and impact from day one.
- **Remote/Hybrid**: Hybrid – offices in New York, London, and Boston. Open roles in New York and London are listed as hybrid.
- **Notable perks**: Fast-paced environment with 10+ daily product updates; opportunity to shape an AI product that transforms a $100T market; working alongside experienced fintech leaders (ex-GoCardless).
- **Open roles (as of search)**: Senior Product Engineer (Fullstack), Founding Account Executive, Founding SDR – all hybrid in New York or London.

## Sources
1. [lunos.ai](https://www.lunos.ai/)
2. [lunos.ai/about](https://www.lunos.ai/about)
3. [linkedin.com/company/lunos-ai](https://linkedin.com/company/lunos-ai)
4. [jobs.gem.com/lunos-ai](https://jobs.gem.com/lunos-ai)
5. [theorg.com/org/lunos-1](https://theorg.com/org/lunos-1)

## Other roles at Lunos

- [Product @ Lunos](https://feeny.ai/job/product-lunos-lunos-new-york-bs6ys5znfd9c) — New York, NY
- [Founding Sales Development Representative (SDR)](https://feeny.ai/job/founding-sales-development-representative-sdr-lunos-new-york-43k7vrawyrah) — New York, NY
- [Founding Account Executive](https://feeny.ai/job/founding-account-executive-lunos-new-york-cftdg04fwg0x) — New York, NY