Salary: £29,000 - 69,000 per year Requirements: We are looking for an experienced, fluent English-speaking Machine Learner who is located in Barcelona or willing to relocate. We want strong machine learning judgment and experience building models for difficult real-world systems. We need someone who can reason from first principles about data, models, compute, uncertainty, validation, and product usefulness. We value depth, judgment, and evidence of exceptional work more than formal credentials. You may have PhD-level training in machine learning, physics, biology, chemistry, applied mathematics, computational biology, or another systems-oriented discipline. You should have strong foundations in one or more of: applied mathematics, statistics, optimisation, probabilistic modelling, causal inference, dynamical systems, scientific ML, or related areas. You may also be an exceptional applied ML engineer without a PhD, with a track record of building models for complex real-world systems. Experience with biological data is useful, but not required. We are looking for someone comfortable with natural-world systems that are messy, noisy, sparse, nonlinear, and only partially observed. Responsibilities: We are building an in-person team in Barcelona that works together in English. We are tackling hard technical challenges at the edge of machine learning, biology, and experimental science. We are developing ways to learn useful representations of cellular state from sparse, noisy, high-dimensional, and incomplete biological data. We are combining biological knowledge with machine learning to build models that are predictive and biologically meaningful. We are creating models that help scientists understand uncertainty, compare hypotheses, and decide what to test next. We are evaluating models in problem spaces where there is no clean benchmark for understanding a cell. We are building systems that help users make better decisions. We are supporting relocation and visa sponsorship where needed. Technologies: Support Machine Learning More: We are a rapidly expanding SaaS company building an in-person team in Barcelona and working together in English. We value curiosity, kindness, and purposeful execution, and we care deeply about technical depth as well as how people collaborate, learn, communicate, and support one another. We offer competitive salary, meaningful early-employee equity, flexible time off, flexible work-from-home arrangements, a learning and conference budget, high-quality equipment, and practical relocation support to help make Barcelona home if needed. We are an equal opportunities employer, and this opportunity is being promoted by Advancing People Ltd, a recruitment specialist acting as both an Employment Business and Employment Agency. last updated 24 week of 2026