Founding Engineer

Job description

Do you have experience working at an early-stage startup and want to do it again, properly this time?

Are you excited by real ownership, commercial impact, and building something genuinely category-defining?

Founding Engineer (Product-Led) – AI-native Workspace

Salary: £120k - £160k + equity

Location: London, Onsite

Experience: 3-8 years (startup / founding engineer background preferred)

We’re partnered with a pre-seed AI startup building agentic AI systems that radically improve how knowledge workers think, decide, and get work done. This is not another chatbot. This is an AI-native product being built from first principles by engineers from elite technical environments (e.g. Palantir, Citadel).

They’re now looking for a Founding Engineer, someone who’s either:

• Already been a founding / early engineer or
• Worked in a fast-moving, high-growth startup and understands what it takes to ship real product, fast, with users in mind

You’ll work directly on:

• Core agent loops (prompting, tool selection, model choice, memory & context)
• High-performance, real-time LLM-powered UX
• Making autonomous systems reliable enough for daily, mission-critical work

As a Founding Engineer, you’ll wear many hats:

• Backend: Python
• Frontend: TypeScript, React
• AI/LLMs everywhere (Cursor/Copilot as a daily workflow)
• Architectural decisions & trade-offs
• Product thinking & UX judgment
• Talking to users and rapidly iterating
• Full SDLC ownership; build, ship, break, fix, repeat

What they’re looking for:

• Strong commercial & product mindset – you care about outcomes, not just code
• Comfortable in ambiguity and zero-to-one environments
• Proven ability to ship fast in small teams
• AI-native way of working (LLMs are tools, not toys)
• Resilient, adaptable, and genuinely excited by hard problems

Why join now?

• Real ownership — technical and product
• Small, elite team that ships fast
• Well-funded with long runway
• You’ll help define a product shaping the next generation of software
• Not another boring B2B Saas… this is something you’d actually use

If you’re ready to step into a true founding-level role, influence the product direction, and build something genuinely new, this is the one. Interested? Apply now!

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

03-04-2026

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