Junior Data Scientist

Data Scientist – Ravelin

Ravelin is a fraud detection company that uses advanced machine learning and network analysis to solve big problems and make online transactions safer.

The Detection team keeps fraud rates low and clients happy by continuously training and deploying machine learning models. They work closely with the Data Engineering Team and the Intelligence & Investigations Team.

We are looking for a Data Scientist to help train, deploy, debug and evaluate our fraud detection models. The ideal candidate is pragmatic, approachable and knowledgeable with a strong track record of building robust models.

• Build our model evaluation and training infrastructure
• Develop and deploy new models to detect fraud while maintaining SLAs
• Write new features in our production infrastructure
• Research new techniques to disrupt fraudulent behaviour
• Investigate model performance issues

• ~1 year of experience building and deploying ML models using the Python data stack (numpy, pandas, sklearn)
• Strong analytical skills
• Excellent collaboration with cross‑functional teams
• Clear communication of complex technical ideas to a range of audiences
• Prioritization and workload management
• Comfort working with a hybrid team

• Flexible Working Hours & Remote‑First Environment
• Comprehensive BUPA Health Insurance
• £1,000 Annual Wellness and Learning Budget
• Monthly Wellbeing and Learning Day
• 25 Days Holiday + Bank Holidays + 1 Extra Cultural Day
• Mental Health Support via Spill
• Aviva Pension Scheme
• Ravelin Gives Back – monthly charitable donations and volunteer opportunities
• Fortnightly Randomised Team Lunches
• Cycle‑to‑Work Scheme
• BorrowMyDoggy Access – spend time with a furry friend
• Weekly Board Game Nights & Social Budget
• Job offers may be withdrawn if candidates do not meet our pre‑employment checks: unspent criminal convictions, employment verification, and right to work.*

Location: London, England, United Kingdom