Looking for principal data scientist jobs in London with visa sponsorship? Marshmallow is hiring a Principal Data Scientist in London (hybrid) to lead data science across Claims Fraud and automation.
Principal Data Scientist Jobs in London: Overview
| Job Title | Principal Data Scientist |
| Employer | Marshmallow |
| Location | London (hybrid, 3 days in office) |
| Salary | Not specified in the available job information |
| Job Type | Full time |
| Experience | Significant commercial experience in end-to-end ML |
| Visa Sponsorship | Confirmed |
| Closing Date | Not specified in the available job information |
About the Employer
Marshmallow is a UK insurtech company founded in 2017 that provides car insurance and related financial products, with a focus on making migration easier. It has grown to over 700 people, achieved unicorn status, and raised substantial funding while turning profitable.
Job Responsibilities
- Provide technical leadership for data science across Claims Fraud, shaping risk decisioning and fraud detection with Product and Engineering
- Design, build and iterate on production ML and Generative AI/LLM systems for claims validation and automation
- Collaborate on system-level thinking for models, data and workflows to scale decisioning
- Advocate for platform and tooling investments needed for AI-driven claims automation
- Set a high bar for statistical rigour, experimentation and measurement in Claims
- Influence technical direction across Data Science and Engineering for scalable solutions
Requirements
- Significant commercial experience delivering end-to-end Machine Learning solutions from problem framing to production monitoring
- Hands-on experience building and shipping Generative AI systems in production, including evaluation and integration
- Strong statistical and modelling foundation with experience in risk-based decisioning under uncertainty such as fraud or insurance
- Proven ability to influence technical direction and shape scalable model integration patterns
- Strong stakeholder management skills for communicating trade-offs with Product and Engineering
Visa Sponsorship and International Applicants
Marshmallow confirms it is able to offer visa sponsorship for this position. The role is open to international applicants who meet the requirements.
Salary and Benefits
- Bonus scheme designed to reward high performance
- Private medical insurance with Vitality and mental health support with Oliva
- Personal learning budget and 2 dedicated L&D days a year
- Monthly flexible benefits budget
- 25 days holiday plus bank holidays
- 4 weeks Work From Anywhere per year
- Visa sponsorship confirmed
- Hybrid working in London
- Strong equity and benefits package
- Salary not specified
- Closing date not given
How to Apply
Applications are handled through Marshmallow’s Ashby careers portal. Submit a CV or resume as prompted; the process includes an initial talent team call, past experience interview, systems design and technical interview, and culture interview.
Application Tips
- Highlight production experience with generative AI and ML systems in regulated or risk domains
- Prepare examples of influencing cross-functional technical decisions and communicating trade-offs
Browse more Technology Jobs and Visa Sponsorship Jobs on CMAJobs.
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