About the Company
We are Ravelin, a fraud detection company using advanced machine learning and network analysis technology to solve big problems. Our goal is to make online transactions safer and help our clients feel confident serving their customers.
We have a strong culture based on empathy, ambition, unity and integrity, and we pride ourselves on a flat hierarchy. We value work/life balance and offer a friendly, engaging environment.
The Team
You will be joining the Detection team, responsible for keeping fraud rates low and clients happy by continuously training and deploying machine learning models. Our models detect various fraud types in real time under strict SLAs, targeting <300 ms per prediction. The team works closely with Data Engineering and Intelligence & Investigations teams.
The Role
Data Scientist to help train, deploy, debug and evaluate fraud detection models. We need someone pragmatic, approachable, with judgement in ambiguous labeling scenarios and a strong ability to build robust models that adapt to new fraud tactics.
Responsibilities
- Build out 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 and debug models
Requirements
- About 1 year of experience building and deploying ML models using Python data stack (numpy, pandas, sklearn)
- Strong analytical skills
- Strong collaboration with teammates across teams (client support, engineering, etc.)
- Excellent communication of complex technical ideas to diverse audiences
- Ability to prioritise and manage workload
- Comfortable working in a hybrid team
Benefits
- Flexible working hours & remote‑first environment
- Comprehensive BUPA health insurance
- £1,000 annual wellness and learning budget
- Monthly wellbeing and learning day (last Friday of the month)
- 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
- Weekly board game nights & social budget
- Job offers may be withdrawn if candidates do not meet pre‑employment checks (unspent criminal convictions, employment verification, right to work).
Seniority Level
Entry level
Employment Type
Full‑time
Job Function
Other
Industry
IT Services and IT Consulting
Location
London, England, United Kingdom
