Applied AI Engineer in London

Prototype, evaluate, ship, measure, improve. Design evals that measure what matters, driving meaningful improvements. Shape and ship what's next - high ownership. The craft is in careful prompting, tight loops, sharp evals, and spotting when the agent's quietly wrong.

Top-uni CS / maths / engineering / science, or equivalent in what you've built. Shipped production LLM systems — RAG, prompting, agents. You've worked somewhere fast — startup or strong tech team — and make good calls on imperfect information. You know software engineering: you’ve launched systems, responded to incidents, designed for failure. You scope problems, own solutions, and help decide what we build next. Small team — it matters.

Every business needs to know who they’re really working with whether it’s suppliers, investors, partners, or third parties. At Xapien, we’re reinventing how organisations do that, combining speed, scale and accuracy with cutting-edge AI. Since 2018, we’ve grown from a deep-tech startup to a global player in AI-driven due diligence and risk intelligence. With new regulations, rising compliance pressure and growing reputation risks, organisations everywhere are demanding smarter, faster ways to work and they’re turning to us. Customers worldwide from global law firms and private banks to universities and nonprofits rely on Xapien to turn days of manual research into trusted insights, delivered in minutes.

Customers in a diverse range of industries, with particular growth in wealth management, financial services and supply chain onboarding. Demand accelerating beyond our UK headquarters, across multiple continents with new customers in the Middle East, Asia, and Oceania.

Whether you’re in marketing, communications, sales, or finance, you’ll play a critical role in driving growth, building credibility, and defining how we connect our product to a rapidly evolving market. We’re scaling fast with more customers, more releases, and bigger regulatory and market challenges. You won’t just be executing campaigns, closing deals, or managing numbers, you’ll be influencing strategy, optimising processes, and helping position a brand that’s setting the new standard for trust and transparency.

We are going to work with you - to build a rewarding and fulfilling career with the opportunities, challenges and resources you need to do your best work. We succeed together - you will own a meaningful part of the business through our employee shares & equity programme. Private health insurance to keep you in tip-top condition. Life Insurance – let's hope nobody ever needs this! Unlimited holidays – yes, it really is uncapped – take the time you need, when you need it. Everyone is learning, developing and challenging themselves so we have a £1k professional development fund per year if you want to learn new skills, even new things outside of work. Most importantly of all, we will work with you, to help you realise your fullest potential, always.