LLM Data Researcher

The next generation of models will be shaped by knowledge that cannot be scraped: the judgment of the lawyers, doctors, engineers and tax advisors who do the work. Sovrano turns that judgment into post-training data, rubrics and benchmarks. This role answers, with evidence, whether that data makes models better, and then tells the team what to do about it. Sovrano AI is a data and research lab in Barcelona. Sovrano brings real experts into building AI: they do the work, Sovrano captures their judgment, and turns it into the data, benchmarks and evidence that frontier AI labs, robotics companies and enterprise AI teams use to train and evaluate their models. Behind it sit a network of 400,000 or more professionals, 100 or more partner universities across Europe, EFMD certification, 23 languages and EuroExec, Sovrano's own benchmark. The internet has been read. The gains now come from post-training and evaluation on expert work, and whoever defines what good work looks like is shaping the frontier. Europe has the experts, the universities and the research talent to build that layer, and too many of its best machine learning researchers leave to do frontier work elsewhere. This is a founding seat on the research team that intends to build it here. The week is about 80 percent research: training, evaluating, publishing. The other 20 percent is communication and coordination, with clients, with marketing and with the data team. You report to Pau Arnal, Founding Researcher, who leads the research team and sets its agenda, and you work directly with him and with the CEO. Said plainly: scope moves as results and clients come in. Some weeks you train models all week, some weeks you are on a call explaining why a data spec should change. Much of the research infrastructure you need is yours to build. The trade is ownership most researchers wait a decade for: a research agenda that is genuinely yours to shape, and results that change what the company does the following week.