Founding Engineer (TypeScript/AI)

Oliver Bernard; Greater London; Hybrid; GBP 90,000 - 110,000; Full time

Benefits offered by this job

Meaningful equity

Founding-level ownership

Fast decision-making

Job summary

A seed-stage SaaS startup in Greater London is seeking a hands-on engineer to shape the product and architecture from the ground up. With a focus on Next.js, Node.js, and TypeScript, you'll work closely with the CEO and a small team of engineers. The role offers up to £100k plus meaningful equity and requires being hybrid, with 2+ days in Moorgate. Ideal for someone passionate about building AI-driven SaaS products seeking substantial ownership in an agile, fast-paced environment.

Qualifications

• Experience in full-stack development with a focus on backend technologies.
• Strong proficiency in Next.js and Node.js.
• Ability to work in a fast-paced, startup environment.

Responsibilities

• Engage in full-stack engineering with a backend-leaning focus.
• Collaborate with the CEO to shape the product roadmap.
• Build alongside a small, senior engineering team.

Skills

Full-stack engineering

Next.js

Node.js

TypeScript

Python

Job description

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.

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
• 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 👋