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Senior Data Scientist

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Data Idols

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

85000.00 - 95000.00 GBP / Year
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Job Description:

We are currently looking for a Senior Data Scientist to join a fast-paced, early-stage AI startup building cutting-edge technology in the mobile app space. Reporting directly to the co-founders, this Lead Data Scientist will play a critical role in shaping the company’s core product and driving real commercial impact from day one. As a Senior Data Scientist, you’ll be working at the heart of the business, designing and deploying machine learning models that predict user behaviour, helping clients optimise for revenue, retention, and long-term value rather than just installs. This Senior Data Scientist will take ownership of a key part of the platform, working closely with the founders to turn complex data into actionable, high-impact solutions. Day-to-day, the Senior Data Scientist will be building models, experimenting with new approaches, and continuously improving performance across customer datasets. You’ll be operating in a highly collaborative but autonomous environment where your work directly influences product direction and business outcomes.

Job Responsibility:

  • Design and build advanced machine learning models focused on: User behaviour prediction
  • Churn and propensity modelling
  • Develop a scalable “model factory” capable of generating bespoke models per client
  • Work with complex behavioural event data from mobile applications
  • Collaborate directly with the founders on product and technical direction
  • Continuously experiment, iterate and improve model performance
  • Own a key part of the data science stack end-to-end

Requirements:

  • Strong experience in machine learning/data science (typically 4-8+ years)
  • Proven experience building and deploying ML models in production
  • Solid understanding of: Churn modelling
  • Propensity modelling
  • Behavioural data analysis
  • Strong Python skills (e.g. Pandas, NumPy, ML libraries)
  • Experience working with real-world, messy datasets
  • Ability to work autonomously in a fast-paced environment
What we offer:
  • Meaningful equity in a high-growth startup
  • Opportunity to work alongside experienced founders
  • High ownership and autonomy from day one
  • Exposure to cutting-edge machine learning challenges
  • Clear progression as the company scales
  • Hybrid working (London-based, 2-3 days in office)

Additional Information:

Job Posted:
April 16, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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