London, United Kingdom Hybrid Employment

marshmallow is hiring a Senior Data Scientist

Responsibilities

  • Build and iterate on multimodal AI models that reduce claims cost and improve claims processing, including models that analyse emails, documents, and claim summaries for operational teams
  • Develop machine learning models that support claims automation, including use cases such as negotiation strategies, litigation strategies, and total loss prediction
  • Explore and evaluate new data sources that could improve model performance and decision-making, such as fraud signals, open banking, and telematics data
  • Design and build agentic AI solutions to automate and streamline claims workflows
  • Collaborate closely with Product, Data, and Engineering teams to test hypotheses, develop new features, and turn ideas into production-ready solutions
  • Work with the MLOps team to improve data science and AI model infrastructure, including deployment, monitoring, evaluation, and feedback loops
  • Help define the right technical approach for problems, balancing speed, quality, and scalability while ensuring solutions are practical for the business
  • Set a strong standard for experimentation, measurement, and model performance, helping the team understand impact, uncertainty, and trade-offs clearly

Requirements

  • Strong 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 production AI or machine learning systems, including evaluation, quality considerations, and integration into operational workflows
  • Experience working on applied problems involving structured and unstructured data, with an interest in multimodal modelling and AI systems
  • A strong statistical and modelling foundation, with experience working on risk-based decisioning or other complex, uncertain problem domains
  • Proven ability to work cross-functionally with Product, Engineering, Operations, and MLOps to deliver scalable solutions
  • Strong communication and stakeholder management skills, with confidence in discussing trade-offs and pushing back constructively when needed

Benefits

  • Bonus scheme designed to reward high performance
  • Private medical insurance with Vitality, mental health support with Oliva
  • Personal learning budget and 2 dedicated L&D days a year
  • Monthly flexible benefits budget to spend as you choose
  • 25 days holiday plus bank holidays
  • 4 weeks Work From Anywhere per year

Work Arrangement

Hybrid — London

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 2 months ago