Founding Engineer (TypeScript/AI)

Job description

Founding Engineer | Seed-stage AI SaaS (£100k + equity)

We’re hiring for a seed-stage SaaS startup backed by Balderton (near £5m raised) that’s using AI to fundamentally redefine its product.

The company is pre-PMF and mid-pivot, at a genuine inflection point, and looking for a hands-on engineer (~80% coding) to help shape the product, architecture, and technical foundations from the ground up.

Compensation

Up to £100k + meaningful equity

What you’ll be doing

• Full-stack engineering (backend-leaning): Next.js (FE + BE), Node.js, TypeScript, with some legacy Python
• Working closely with the CEO & product to shape roadmap and direction
• Building alongside a small, senior team (3 engineers) with true peer ownership
• Iterating fast
• Shipping real-world AI / agentic systems, not proof of concepts

Setup & culture

• Hybrid: 2+ days per week in Moorgate
• Small, flat team — low ego, high agency
• Fast decisions, high trust, minimal processes

If you love building SaaS products with AI and want founding-level ownership, we should talk

Founding Engineer | Seed-stage AI SaaS (£100k + equity)

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

07-03-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English