Founding Engineer at Delfa.ai

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.

Job Title: Founding Engineer

Company Description: Delfa.ai - Air Street Capital-backed AI startup

Job Description:
As a Founding Engineer, you will build and scale autonomous AI agents that automate clinical trial recruitment. You will own complex technical systems from architecture to deployment, directly impacting how life-saving treatments reach patients. Working in a high-talent density environment, you will solve 0→1 engineering challenges while scaling a product with seven-figure ARR.

Location: London, UK

Why this role is remarkable:

• Join a high-growth startup with seven-figure ARR growing 25% MoM, backed by an oversubscribed $3.8M seed round from tier-one AI investor Air Street Capital.

• Work alongside a world-class team including foundation model researchers from ETH Zurich, medical doctors, and engineers who have deployed production AI at J&J and Exscientia.

• Take full ownership of critical technical decisions and build systems from scratch that solve the $120 billion bottleneck in clinical trial patient recruitment.

What you will do:

• Architect and scale core systems powering AI agents, managing everything from voice interactions to intelligent workflow orchestration across clinical trial sites.

• Drive complex engineering projects end-to-end, taking full responsibility for product features from initial design to production deployment and monitoring.

• Collaborate with a multidisciplinary team of AI researchers and clinical experts to build robust, reliable tools using a modern stack including FastAPI, Temporal, and LLMs.

The ideal candidate:

• At least 3+ years of full-stack engineering experience with a proven track record of building and shipping high-quality software products at high speed.

• Strong ownership mindset with the ability to navigate ambiguous 0→1 environments and translate customer problems into scalable technical solutions.

• Deep builder instincts evidenced by significant side projects, open-source contributions, or experience with modern tools like TypeScript, React, and PostgreSQL.

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.