Founding Product Engineer Equity at cubic

Founding Product Engineer

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

Company

Description:

cubic - VC-backed AI-native replacement to Git Hub

Location: London, UK

Job Description: 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.

• 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.

• 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.

• 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.