Staff Data Scientist

Marshmallow

London · Full-time · Hybrid · Posted Oct 6, 2026

At a glance

Employment
Full-time
Workplace
Hybrid
Location
London
Visa sponsorship
Visa sponsorship available

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 shipping production-grade AI systems while collaborating with Product and Engineering to ensure scalable, robust, and sustainable decisioning solutions.

Responsibilities

  • Provide technical leadership for data science across Claims Fraud, shaping risk decisioning and fraud detection strategies.
  • Design, build, and iterate on production ML and Generative AI/LLM systems for claims validation and automation.
  • Collaborate with Claims data scientists to implement system-level thinking for models, data, and workflows.
  • Identify architectural improvements to scale decisioning and reduce time-to-production.
  • Advocate for platform and tooling investments, including monitoring, feedback loops, and QA.
  • Ensure technical solutions align with the multi-year vision for automated claims handling.
  • Set high standards for statistical rigour, experimentation, and measurement.
  • Communicate Claims performance and uncertainty to senior stakeholders.

Requirements

  • Significant commercial experience delivering end-to-end Machine Learning solutions from problem framing to production deployment.
  • Hands-on experience building and shipping Generative AI systems in production, including evaluation and safety considerations.
  • Strong statistical and modelling foundation with experience in risk-based decisioning under uncertainty.
  • Proven ability to influence technical direction across Data Science and Engineering.
  • Strong stakeholder management skills with the ability to communicate trade-offs and challenge proposals constructively.

Benefits

  • Bonus scheme
  • Private medical insurance with Vitality
  • Mental health support with Oliva
  • Personal learning budget
  • 2 dedicated L&D days per year
  • Monthly flexible benefits budget
  • 25 days holiday plus bank holidays
  • 4 weeks Work From Anywhere per year

Workplace

  • Hybrid role requiring 3 days per week in the London office.

Skills

  • Machine Learning
  • Generative AI
  • Risk-based Decisioning
  • Fraud Detection
  • QA

Marshmallow

Staff Data Scientist

Apply now