Principal Data Scientist
marshmallowLondon, England, United Kingdom
Posted February 18, 2026
Full Time
About the Company
Marshmallow is a company that exists to make migration easy. We're looking for people who are passionate and skilled to help us achieve our company mission.
Job Description
We exist to make migration easy. A Principal Data Scientist is needed to provide technical leadership for data science across Claims Fraud, shaping the approach to risk decisioning and fraud detection in partnership with Product and Engineering. The role involves designing, building, and iterating on production ML and Generative AI/LLM systems that support claims validation and automation.
Requirements
- 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
- Proven ability to influence technical direction across Data Science and Engineering
Benefits
- Flexible working
- Competitive bonus scheme
- Flexible benefits budget
- Mental wellbeing support
- Learning and development
- Private health care
- Medical cash plan
- Tech scheme
- 33 days holiday
- Pension
- Cycle to work scheme
- Monthly team socials
- Company-wide socials
