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Technical Co-Founder

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Jack & Jill
Full Time position
Listed on 2026-02-14
Job specializations:
  • Software Development
    AI Engineer
Job Description & How to Apply Below
Location: Greater London

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Technical Co-Founder

Company

Description:

Early-stage AI consumer startup

Job Description:

As a Technical Co-Founder, you will partner with the founder from day one to architect and build a transformative consumer product from the ground up. You will lead the technical vision, conceptualize complex features, and ship a high-quality product while navigating the creative chaos and rapid pace of a pre-seed venture.

Location: London, UK

Why this role is remarkable:
  • True day-one partnership with the opportunity to shape the entire product vision and engineering culture from scratch.
  • High-impact leadership role within the booming AI space, focusing on building a proprietary and innovative consumer-facing application.
  • Deep equity stake and influential founding status in a London-based venture backed by a clear, ambitious mission.
What you will do:
  • Lead the end-to-end technical development, from initial concept and prototyping to shipping a production-ready MVP.
  • Integrate advanced AI capabilities into a seamless user experience, ensuring the tech stack is scalable and modern.
  • Collaborate directly with the founder to navigate strategic uncertainty, pivot quickly, and manage the technical roadmap.
The ideal candidate:
  • Full-stack engineering expert with a proven track record of shipping successful consumer products in fast-paced environments.
  • Passionate about AI and LLMs, with the hands-on ability to implement machine learning features and iterate rapidly.
  • Resident of London or within a 90-minute commute, possessing an entrepreneurial mindset comfortable with ambiguity and early-stage startup dynamics.
Who are Jack & Jill?

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps

Step
1. Visit our website
.

Step
2. Click 'Talk to Jack'.

Step
3. Talk to Jack so he can understand your experience and ambitions.

Step
4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.

Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.

Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.

#J-18808-Ljbffr
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