Research Engineer

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 Research Engineer Salary £70k–£120k + Equity Company Description Electric Twin is a London-based AI company that has raised $14M from Atomico and LocalGlobe to build synthetic populations for behavioral prediction. Founded by a former Chief Adviser to the Prime Minister and a military commander, they use LLMs to simulate human responses for global brands with 95% accuracy. Job Description You will research and build the cognitive architectures that bring AI agents to life, balancing behavioral science with backend engineering. Working within the Science team, you'll design memory systems and decision-making frameworks to create realistic synthetic populations. This is a high-impact role bridging the gap between LLM research and production-scale infrastructure. Location London, UK Why this role is remarkable Work on a unique product that uses LLMs to solve the $90B market research problem, achieving 10,000x faster insights than traditional methods.Backed by heavyweight investors including Atomico, LocalGlobe, and angels like Marc Andreessen and the CTO of Slack.Direct collaboration with academic leaders from the London School of Economics to publish research and define the future of agentic modeling. What You Will Do Design and run systematic experiments to evaluate synthetic agent behavior and validate performance against real-world human data sets.Build sophisticated cognitive systems using advanced LLM techniques like chain-of-thought prompting, RAG architectures, and multi-agent tool use.Implement robust memory and personality frameworks that ensure AI agents maintain consistent demographics and behavioral patterns across interactions. The ideal candidate Has over 7 years of engineering experience with at least 1 year hands-on with LLMs, production RAG, and agentic workflows.Possesses a strong research background in quantitative fields like computational social science, physics, or cognitive modeling to simulate human systems.Proficient in Python and backend frameworks like FastAPI, with the ability to take complex AI prototypes into scalable production environments. 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. How does this work? Jack's an AI agent for job searching and career coaching. He works for you.Jill is the AI recruiter working for the company. She recruits from Jack's network.If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives. 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.