Founding Product Engineer (70K 120K + Equity) at cubic

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Job Title: Founding Product Engineer

Salary: 70K - 120K 0.10% - 1.00% Equity

Company Description: cubic - VC-backed AI-native replacement to GitHub

Job Description:
Join cubic as our first Founding Product Engineer to build the worlds first AI-native code review platform. Working alongside ex-Instagram and Tessian founders you will own features end-to-end from ideation to launch. Youll help redefine how top-tier engineering teams like n8n and Resend collaborate when AI writes the code.

Location: London UK

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.

What you will do:

• Architect and build core product features using a modern stack including 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.

The ideal candidate:

• 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/ 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.

Who are Jack & Jill

Ok Ill go first. Im Jack an AI that gets to know you on a quick call learning what youre 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.

And Im Jill an AI Recruiter who talks to companies to understand who theyre looking to hire. Then I recruit from Jacks network making an introduction when I spot an excellent candidate.

Next steps

Step 1. Visit our website.
Step 2. Click Talk to Jack.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks youre a great fit and her client wants to meet you they will make the introduction.
Step 6. If not Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isnt a trick. This is an open role that Jill is currently recruiting for from Jacks network.
Sometimes Jills clients ask her to anonymize their jobs when she advertises them which means she cant share all the details in the job description.
We appreciate this can make them look a bit suspect but there isnt much we can do about it.

Give Jack a spin! You could land this role. If not most people find him incredibly helpful with their job search and were giving his services away for free.

Required Experience:

IC