London, United Kingdom Hybrid Full-time

marshmallow is hiring a Staff Data Scientist

Responsibilities

  • 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

Requirements

  • 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

Work Arrangement

Hybrid — London

Additional Information

  • 3 days in office
  • 4 weeks Work From Anywhere per year

Visa sponsorship available

About company
marshmallow

We exist to make migration easy. We started Marshmallow when we found out how unfair insurance prices are for people who move to the UK. Purely because traditional insurers haven’t made any effort to price them properly.

So we decided to do what no one else was doing. We built our own technology, and developed pricing and fraud models to cater to their unique experiences. Since then, we’ve helped millions of UK newcomers get a fairer deal on their car insurance.

We're building the financial services that newcomers need — starting with car insurance. We're a tech-first company focused on fairness, inclusion, and innovation.

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Job Details
Department Data Science
Category data
Posted 3 months ago