AI Engineer at $14M Atomico-backed AI startup modeling human behavior

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: https://www.jackandjill.ai/jobs/ai-engineer-at-14m-atomico-backed-ai-startup-modeling-human-behavior-f0c573d6-9d93-46c7-9c9e-6ef612249ff9/apply?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_f0c573d6-9d93-46c7-9c9e-6ef612249ff9.

Job Title

AI Engineer

Salary

Not Disclosed

Company Description

$14M Atomico-backed AI startup modeling human behavior

Job Description

You will research and build cognitive architectures for AI agents that simulate human populations with 95% accuracy. Balancing LLM experimentation with backend engineering, you’ll develop memory and reasoning systems validated by London School of Economics research, enabling global brands to predict audience responses to messaging and products in seconds.

Location:

London, UK

Why This Role Is Remarkable

• Work on world-first technology validated by the London School of Economics that delivers human insights 10,000x faster than traditional research methods.
• Backed by a $14M investment from top-tier VCs like Atomico and LocalGlobe, alongside elite angels including Marc Andreessen and the CTO of Slack.
• Founded by a former Chief Adviser to the UK Prime Minister and a military commander, offering unique leadership at the intersection of data science and high-stakes decision making.

What You Will Do

• Design and implement cognitive systems for AI agents using advanced LLM techniques including RAG, chain-of-thought prompting, and agentic tool use.
• Run systematic experiments to validate synthetic agent behavior against real-world data, iterating on behavioral frameworks for diverse demographics.
• Build and scale the backend infrastructure using Python and FastAPI to deploy these realistic simulations in production for enterprise clients.

The Ideal Candidate

• Possesses a strong research background in human behavior, cognitive modeling, or agent-based social simulation paired with robust backend engineering skills.
• Has over 7 years of technical experience with at least 1 year of hands-on experience building production-grade LLM applications and multi-agent systems.
• Demonstrates an ownership mentality and technical proficiency in Python, PyTorch, and LangChain to move projects from hypothesis to deployment.

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 the job listing: https://www.jackandjill.ai/jobs/ai-engineer-at-14m-atomico-backed-ai-startup-modeling-human-behavior-f0c573d6-9d93-46c7-9c9e-6ef612249ff9?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_f0c573d6-9d93-46c7-9c9e-6ef612249ff9.

Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/ai-engineer-at-14m-atomico-backed-ai-startup-modeling-human-behavior-f0c573d6-9d93-46c7-9c9e-6ef612249ff9/apply?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_f0c573d6-9d93-46c7-9c9e-6ef612249ff9

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.