Staff Data Scientist

About the role

The Staff Data Scientist will provide technical leadership within the Claims team, focusing on automating the claims journey through traditional machine learning and Generative AI. This role involves designing and deploying production-grade AI systems while collaborating with Product and Engineering to ensure scalable, robust decisioning solutions. The position requires a strategic thinker who can influence technical direction and maintain high standards for statistical rigour and system performance.

Responsibilities

• Provide technical leadership for data science across Claims Fraud, shaping the approach to risk decisioning and fraud detection.
• Design, build and iterate on production ML and Generative AI/LLM systems that support claims validation and automation.
• Collaborate with other data scientists to identify architectural improvements needed to scale decisioning and reduce time-to-production.
• Advocate for platform and tooling investments such as monitoring, feedback loops, and QA to achieve AI-driven automation.
• Set a high bar for statistical rigour, experimentation, and measurement to improve performance communication to senior stakeholders.

Required skills

• Machine Learning
• Generative AI
• LLM
• Risk-based decisioning
• System design
• Stakeholder management

Qualifications

• Significant commercial experience delivering end-to-end Machine Learning solutions
• Hands-on experience building and shipping Generative AI systems in production
• Strong statistical and modelling foundation

Benefits

• Bonus scheme
• Private medical insurance
• Mental health support
• Personal learning budget
• 25 days holiday plus bank holidays
• 4 weeks Work From Anywhere

About the Company

Marshmallow is a unicorn financial services company founded in 2017 that has grown to over 700 employees. The company focuses on insurance and car loans, with a goal to become one of the largest financial services providers in the world.