Staff Data Scientist

Join Marshmallow as a Staff Data Scientist, leading advancements in claims automation through innovative machine learning and generative AI solutions.

• 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.
• Significant commercial experience delivering end-to-end Machine Learning solutions, from problem framing and experimentation through to production deployment and ongoing monitoring
• Hands-on experience building and shipping Generative AI systems in production (not just prototypes), including evaluation, safety/quality considerations, and integration into customer or operational workflows
• Strong statistical and modelling foundation, with experience in risk-based decisioning under uncertainty (e.g., fraud, credit, insurance, or other regulated domains)
• Proven ability to influence technical direction across Data Science and Engineering, including shaping scalable model/service integration patterns and challenging proposals to drive robust, long-term solutions
• Strong stakeholder management skills, with confidence communicating trade-offs and pushing back constructively with Product and Engineering to ensure high-quality outcomes

• Bonus scheme designed to reward high performance
• Private medical insurance with Vitality, mental health support with Oliva
• Personal learning budget and 2 dedicated L&D days a year
• Monthly flexible benefits budget to spend as you choose
• 25 days holiday plus bank holidays
• 4 weeks Work From Anywhere per year