Join cubic as our first Founding Product Engineer to build the world's first AI-native code review platform. Working alongside ex-Instagram and Tessian founders, you will own features end-to-end, from ideation to launch. You'll help redefine how top-tier engineering teams like n8n and Resend collaborate when AI writes the code.
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London, UK£70K - £120K + 0.10% - 1.00% Equity
Featured roleLondon, UK£70K - £120K + 0.10% - 1.00% Equity
Founding Product Engineer at cubic — AI-powered code review platform
Join cubic, the YC-backed startup building the world’s first AI-native code review platform. Fresh off a massive seed round backed by Sequoia India and Vercel execs, cubic is growing 50% MoM and is already used by elite teams like n8n and Resend. As the first Founding Product Engineer in London, you’ll work directly with repeat founders to rethink how software is built in the age of AI. If you have 6+ years of experience and a passion for high-impact product ownership, this is your chance to define an entirely new category of developer tools.
Overview
Why this role stands out
Company
Responsibilities
What you will do
- Architect and build core product features using a modern stack including Next.js, React, Prisma, Inngest, and the Vercel AI SDK.
- Own the entire product lifecycle from initial user research and prototyping to production deployment and rapid iteration.
- Collaborate directly with the founders to define the technical roadmap and the future of AI-native developer tools.
Candidate profile
Who this is a fit for
- At least 6 years of professional software engineering experience with a track record of building and shipping end-to-end products.
- Deep technical proficiency in the React/Next.js ecosystem and a passion for crafting high-quality user experiences and product outcomes.
- Proven self-starter mentality evidenced by significant side projects, open-source contributions, or previous experience in early-stage startups.
What makes it remarkable
Why this role is remarkable
- Exceptional traction with 50% MoM ARR growth and a high-profile customer base including the Linux Foundation, n8n, and Granola.
- Elite backing from Y-Combinator (X25) and top builders like PeakXV (Sequoia India), Vercel Ventures, and the founders of Resend and v0.
- Opportunity to shape a new product category alongside a team of four repeat founders in a high-velocity, high-autonomy environment.
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.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack