xapien - Senior Applied AI Engineer

• This isn’t just another job role; it’s an opportunity to shape the future of the due diligence industry with a market-leading product trusted by global organisations. 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. Expectations are rising, due diligence now means real-time insight, delivered efficiently and with impact. 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. • For people who love learning, innovating, and making an impact that matters now is the moment to be a part of Xapien. • We turn a week of analyst work into seven minutes. Getting there took a while. Getting to "trust it with a £10bn decision" is the interesting part — and where you come in. • You'll own parts of the Xapien pipeline end-to-end — LLM research agents, entity resolution, report generation. Prototype, evaluate, ship, measure, improve. • Build a system optimised for accuracy, speed and cost • Design evals that measure what matters, driving meaningful improvements • Dig into the failures and fix them at the root • Shape and ship what's next - high ownership • We use Claude Code by default and rarely write code ourselves. The craft is in careful prompting, tight loops, sharp evals, and spotting when the agent's quietly wrong. • Fluent in Claude Code, Codex, or similar agentic tooling. • Strong numerical reasoning. Top-uni CS / maths / engineering / science, or equivalent in what you've built. • Shipped production LLM systems — RAG, prompting, agents. The kind customers pay for. • 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 • High-agency. You scope problems, own solutions, and help decide what we build next. • Focused on real answers for real customers. Theory's a tool, not the point. • Good to work with. Small team — it matters. • Here’s our promise to you: • We are going to work with you - to build a rewarding and fulfilling career with the opportunities, challenges and resources you need to do you 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.