Senior Founding Engineer (£75k–£90k + Equity) at VC-backed social AI startup

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.

Senior Founding Engineer

Salary: £75k–£90k + Equity

Company Description: VC-backed social AI startup

Job Description:
As the first engineering hire, you will build the world's first AI super-neighbour designed to foster local community connections. Working directly with repeat founders, you will architect complex agent systems and backend foundations using LLMs and modern web tech to create a marketplace for local services and social mobility.

Location: London, UK

Why this role is remarkable:

• Join a mission-driven team as the first engineering hire with significant equity and influence over technical culture.

• Work directly with an experienced founding team featuring a CEO with an 8-figure exit and a CTO from top-tier scale-ups.

• Tackle a massive $100bn market opportunity by building new infrastructure that improves human happiness and health.

What you will do:

• Design and implement the core architecture for AI agents and vector-based data foundations.

• Own the end-to-end development of the platform across backend, web, and mobile interfaces.

• Scale community-focused infrastructure to support millions of users while maintaining high performance and security.

The ideal candidate:

• Professional experience with LLMs, LangChain, and modern TypeScript environments like Next.js and Node.

• Proven track record of building and scaling complex systems in a fast-paced startup environment.

• Entrepreneurial mindset with the ability to navigate ambiguity and ship high-quality code rapidly.

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.