Founding Product Engineer at YC-backed AI-native code review platform

Join an elite team of four ex-founders building the world's first AI-native replacement for GitHub. Fresh off a high-profile seed round from Sequoia India and Vercel execs, this startup is growing 50% MoM and already powers the workflows of top engineering teams like n8n and the Linux Foundation. As the first Founding Product Engineer in London, you will have total autonomy to define a new product category, working with a cutting-edge stack (Next.js, Vercel AI SDK, Modal) to rethink how software is built when AI is writing the code. If you have 5+ years of experience and the pragmatism to be your own PM, this is a career-defining opportunity to impact billions of users.

Overview

Role overview

As our first Founding Product Engineer, you will rethink how engineering teams collaborate in an AI-first world. You will own features end-to-end, from ideation to deployment, building the tools used by high-performance teams at n8n and Granola. This is a high-autonomy role requiring hardcore engineering skills and strong product intuition.

Company

cubic

Software

YC-backed AI-native code review platform with funding from Sequoia India and Vercel execs

Responsibilities

What you will do

Lead the end-to-end development of major product features using a modern stack including Next.js, React, and Vercel AI SDK.
Act as your own Product Manager to translate user needs into technical specifications and elegant, functional software.
Prototype and iterate rapidly on AI-driven code review workflows to define an entirely new category of developer tools.

Candidate profile

Who this is a fit for

Has 5+ years of software development experience with a track record as a self-starter or contributor to major open-source projects.
Demonstrates mastery of the modern full-stack ecosystem, specifically React, Next.js, Prisma, Supabase, and AI integration tools.
Possesses a rare blend of hardcore engineering rigor and product taste, obsessing over user outcomes as much as the underlying tech stack.

What makes it remarkable

Why this role is remarkable

Join a fast-growing startup with 50% MoM ARR growth and a high-profile seed round led by Sequoia India and Vercel Ventures.
Work directly with an elite team of four ex-founders, including veterans from Instagram, Tessian, and a previous YC exit.
Shape the future of software development by building an AI-native replacement for GitHub that already powers the world's best engineering teams.

Jack & Jill

How Jack & Jill work together

I get to know what you’re great at, then find roles you’d never find yourself.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.

I recruit from Jack’s network and make the intro when I spot a great match.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.

Meet Jack

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How does this work?

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Jill is the AI recruiter working for the company. She recruits from Jack's network.

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