Principal Data Scientist

Marshmallow · London

In short

▸Líder técnico en ciencia de datos para automatizar reclamaciones con ML y IA generativa.
▸Diseñas y escalas sistemas de IA en producción, trabajando con producto, ingeniería y operaciones.
▸Destacado por liderar soluciones robustas y escalables en un entorno de alto impacto comercial.

No se requiere inglés explícitamente, pero se menciona trabajo con equipos multidisciplina

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What they ask for

✓Experiencia comercial en soluciones de ML desde problem framing hasta producción.
✓Experiencia comprobada en sistemas de IA generativa en producción (no prototipos).
✓Capacidad para influir en equipos multidisciplinarios y desafiar supuestos con razonamiento claro.
✓Habilidades de pensamiento sistémico entre datos, producto e ingeniería.
✓Capacidad para establecer rigurosidad estadística y medición en impacto de modelos.
✓Afán por el impacto real y la mejora continua en procesos de reclamaciones.

Don't tick every box? That's normal — your free dossier shows your gaps and how to cover them in the interview.

Machine LearningGenerative AILLMProduction MLAI systemsData pipelinesModel monitoringFeedback loopsQACross-functional collaboration

Who should you write to at Marshmallow?

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We’re on a mission to make migration easy. We started building Marshmallow in 2017. Since then, we’ve grown from 3 to 700+ people, gained unicorn status, raised ~£140M over three funding rounds, turned profitable, insured millions of drivers and lent millions in car loans. But we’re only just getting started. Our goal is to become one of the largest financial services providers in the world. Over the next 10 years we’ll grow exponentially, not only by scaling our existing products, but also by building new ones. To achieve our goals we need incredibly ambitious, commercially driven people who never settle for ‘good enough’. Marshmallowers are hungry for autonomy and ownership, and would rather improve than coast. Everyone raises standards and has an impact, with a focus on collective success over self-interest. We’ve created an environment where curious, tenacious people win and grow together. If that sounds motivating, this could be the place for you. London (hybrid, 3 days in office) Data Science at Marshmallow Our Data Science team partners across the business to turn data into better decisions, smarter products, and simpler customer journeys. We work closely with Product, Engineering, and Operations to build and ship models and AI systems that are reliable in production and deliver measurable impact. Within Data Science, this role sits in Claims , supporting the function and the broader ambition to automate more of the claims journey. Claims is one of Marshmallow's most important customer touchpoints, and we're looking for a Principal Data Scientist who can provide technical leadership across traditional ML and Generative AI, bring system-level thinking to how we scale decisioning, and confidently challenge proposals to ensure we build robust, sustainable solutions. What you'll be doing Provide technical leadership for data science across Claims Fraud, shaping the approach to risk decisioning and fraud detection in partnership with Product and Engineering Design, build and iterate on production ML and Generative AI/LLM systems that support claims validation and automation Collaborate closely with other Claims data scientists to bring system-level thinking to how models, data and workflows fit together, identifying architectural improvements needed to scale decisioning and reduce time-to-production Be vocal about the platform and tooling investments needed (monitoring, feedback loops, QA) to achieve AI-driven end to end claims automation Advocate for robust, scalable, and strategically aligned technical solutions in cross-functional discussions, ensuring current systems and infrastructure contribute to the multi-year vision for automated claims handling Set a high bar for statistical rigour, experimentation and measurement, helping improve how Claims performance and uncertainty are understood and communicated to senior stakeholders Who You Are You think in systems: you can connect the dots between data science, engineering, and product to shape scalable solutions that build on each other over time. You're confident in challenging assumptions and pushing for the right approach, using strong communication skills to influence stakeholders across seniority levels and disciplines with clear, pragmatic reasoning. You thrive in ambiguity and change, staying resilient and effective during transitions while bringing structure, clarity, and momentum to complex problem spaces. You're motivated by real-world impact, partnering closely with cross-functional teams to drive meaningful automation and better customer outcomes across the claims journey.

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