Senior AI Engineer

Legal AI is only as good as the knowledge behind it. At Lefebvre Sdu, we’ve been building that knowledge for 200 years. Day in, day out. Law by law. Word by word. Other legal AI tools run on our data and software. As the Dutch heart of Lefebvre Group, the European leader in legal and tax knowledge, we’re also developing our own platform: GenIA-L, where lawyers and tax professionals don’t just get an answer, but an answer they’re willing to put their name to. More than 75,000 professionals use it every day, accounting for over €100 million ARR across Europe. We’re looking for a Senior AI Engineer to help shape how the intelligent core of that platform evolves. HOW YOU'LL MOVE US FORWARD GenIA-L is a research platform for legal professionals. A user asks a question. The platform searches our trusted sources and turns them into a usable answer. This is done with agents: specialised AI components that each take on part of the question and work together. In the legal domain, an answer can’t just sound convincing. It has to be correct, and you need to be able to see which source it comes from. This isn’t a pilot: the platform is in production and used heavily every day. As a senior, you build alongside the team, but you also keep the bigger picture in view. You know the different parts of the platform and how they affect one another. You help prioritise, spot obstacles early and make sure we’re heading in the right direction, both in how we work and technically. You look ahead: where could we go, and what do we need to know to get there? And you help medior colleagues grow by seeing exactly where they’re stuck, without taking the work off their hands. - You give direction to the agent architecture of GenIA-L: which specialised agents are needed and how they work together. - You break down legal processes and translate them into technical solutions. You decide how the components are best connected. - You make sure our knowledge packages and the pipelines behind them can scale and stay up to date. A knowledge package is an expert-reviewed set of commentary, case law, legislative history and practical guidance for each article of law. - You build the way we measure quality. Using evaluation sets, observability and metrics, you show that answers, source attribution and reliability are genuinely improving. Not based on gut feeling, but on evidence. - You help prioritise the team’s work and flag technical or process risks early. - You explore new developments, test ideas in practice and turn them into proposals that make the product sharper or faster. - You coach medior engineers and work directly with editors and subject-matter experts.