Product Engineer (Fullstack) — 0 to 1 builder wanted

Are you a designer-minded engineer who can go from pixel-perfect UI to a robust backend architecture without blinking? Do you have the battle scars of building something from scratch — as a founder, a founding engineer, or the first person in the room when the codebase was blank?

A high-growth product team inside a fast-moving fintech is looking for a Fullstack Product Engineer to own a new product line end-to-end. This team operates like a startup within a company — lean, fast, and building MVPs that matter. They won't hand you a spec. They'll expect you to help write it.

What you'll do

▸ Design and ship product — own the user experience and the systems behind it. Frontend-first thinking, backend execution. ▸ Build fast and iterate — MVPs in weeks, not quarters. This team expects you to move quickly and make good decisions under ambiguity. ▸ Shape the product direction — they don't want someone who just builds what they're told. They want someone who challenges, scopes, and argues for the right thing to build. ▸ Own it end-to-end — from initial design to deployment to watching the metrics move. This is a high-ownership role.

The team

This is a moonshot team — a small group operating separately from the day-to-day, with the remit and the freedom to build something genuinely new. The successful candidate will report directly to the head of the organisation. No committee, no lengthy approval chain. Just strong people solving hard problems fast.

The role is in-office in London, 5 days a week. This team works hard — if you want a 9-to-5, this isn't it. If you want to build something you're proud of, it might be exactly right.

What they're looking for

✓ Ex-founder, co-founder, or first-10 engineer at a startup — this is non-negotiable. They need people who know what it feels like to own something. ✓ Frontend-strong with genuine backend capability — comfortable with design, but not afraid to get into infrastructure, APIs, and data models. ✓ 5+ years of strong engineering experience, with evidence of shipping things people use. ✓ Opinionated about product — able to explain not just what was built, but why, and that reasoning holds up under pressure. ✓ Uses AI dev tools daily and can articulate specifically how it changes their output — not just "I use Copilot sometimes." ✓ Ambitious — someone who wants to see their work move metrics, not sit in a backlog.

What they offer

💰 £100,000 – £150,000 base salary

• Meaningful equity — a genuine stake in what you're building
• Private healthcare
• Pension contributions
• Direct access to leadership and genuine influence on the product from day one
• The chance to build something from zero — in a high-growth fintech with the resources to back it